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"Effect of tributylphosphite on antiwear and load carrying properties of mineral base oil containing sulfurized isobutylene has been studied by using a thermodynamically approach and surface analysis data from lubricated surfaces. From this research it is concluded that increasing the concentration of tributylphosphite improves the antiwear properties of mineral base oil with and without sulfurized isobutylene. Increasing concentration of tributylphosphite improves the load carrying properties of base oil, but have no effect on load carrying properties of base oil containing high-sulfurized isobutylene. In the presence of sulfurized isobutylene, in the mild condition tributylphosphite can inhibit adsorption of sulfurized isobutylene. The good combination between these two additives was given by addition about 700 ppm P (from tributylphosphite) to the base oil containing 2000 - 6500 ppm S (from sulfurized isobutylene)."

"Extraction of itrium in the rare earth concentrate of xenotime sand Solvent extraction to yitrium (IQconcentrate from xenotime sand with tributhyl phosphate (T BP) had been done. The concentrate wasextracted using TBP with variants from 20 -100 % (% vol). The attraction time varies from I0 - 60minutes and addition of Ca(NO,), in the feed was 2 - I5 gr / i 0 ml., the result show that distributioncoefficient was (Kd) yttrium 16.53 and separation factor (og) Y-Gd = 2. 44 and Y-Dy = 1.4."

"Penelitian ini melakukan studi pemanfaatan minyak sawit termodifikasi sulfur sebagai minyak dasar broaching oil untuk logam steel dengan viskositas max 86 cSt. Bahan baku adalah minyak sawit termodifikasi melalui proses sulfurisasi non katalis, suhu 150-160 oC selama 3 jam. Sulfur yang digunakan adalah elemental sulfur. Broaching oil disintesis dengan cara mencampur minyak dasar dan paket aditif. Dari studi diketahui bahwa FAME termodifikasi sulfur meghasilkan sifat extreme pressure yang handal. Formulasi optimum diperoleh pada komposisi FAME termodifikasi sulfur-minyak mineral berkadar sulfur 6% w/w. Hasil uji viskositas 25,3 cSt (40 oC), load carrying capacity 400 kgf, scar diameter 0,407 mm, tingkat proteksi korosi kelas 1.b, dan kekasaran permukaan benda kerja 0,0418-0,0579 μm.

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This research studies the utilization of sulfurized palm oil as base oil for broaching process with maximum viscosity 86 cSt. The raw material are modified palm olein via non-catalytic sulfurization, temperature of 150-160 oC for 3 hours. The sulfur from elemental sulfur. Broaching oil made by blending the base oil and additive packages.

From this study it was found that sulfurized FAME will generate excelent extreme pressure properties. The optimum formulation obtained on composition of sulfurized FAME-mineral oil with 6% w/w of sulfur. Result of viscosity are 25,3 cSt (40 oC), load carrying capacity 400 kgf, scar diameter 0,407 mm, class of corrosion protection 1.b, and the surface roughness of workpiece are 0,0418-0,0579 μm."

"ABSTRAKPada pembuatan gemuk bio ini digunakan Kalsium karbonat atau CaCO3 berukuran submikro-mikro sebagai aditif padat untuk meningkatkan sifat antiwear dari gemuk bio yang dihasilkan dengan NLGI #2. Penelitian ini diawali dengan pengepoksidasian minyak sawit pada suhu 65 ˚C; sintesis gemuk bio yang meliputi proses pengadukan, pemanasan, dan saponifikasi pada suhu maksimum 165 ˚C; homogenisasi pada suhu 70 ˚C; serta pengujian karakteristik dan performa gemuk bio yang meliputi uji konsistensi, uji dropping point, serta four ball test untuk menguji sifat antiwear gemuk bio dengan kecepatan putaran sebesar 1150 rpm. Adapun variabel yang terdapat pada penelitian ini yaitu waktu dan suhu selama proses sebagai variabel control; komposisi aditif CaCO3 sebagai variabel bebas; ukuran partikel CaCO3, komposisi base oil, thickener agent, dan BHT serta hasil uji karakteristik sebagai variabel terikat. Hasil yang didapat yaitu gemuk bio NLGI #2 dengan dropping point pada suhu 301 ˚- 317 ˚C. Untuk hasil pengujian antiwear terbaik didapat pada gemuk bio dengan penambahan 3,5% CaCO3 submikro-mikro dengan pengurangan massa ball bearing sebesar 0,7 mg, sementara pada gemuk bio dengan 0% CaCO3 pengurangan tersebut sebesar 250 mg.

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ABSTRACTIn the making of this bio grease, calcium carbonate or CaCO3 in submicro-micro size is used as a solid additive to increase its antiwear properties. To start the research, the epoxidation of palm oil in 65 ˚C is done first; and then synthesizing of bio grease which consists of mixing, heating, and saponification with maximum temperature at 165 ˚C; homogenization in 70 ˚C; and characterization tests that includes the concistency test, dropping point test, and four ball test. The variable contained in this research are time and temperature as control variable; composition of CaCO3 as independent variable; CaCO3 particle size, composition of base oil, thickener agent, BHT, and the result of characterization test as dependent variable. To start the research, the epoxidation of palm oil is done first, and then synthesizing of bio grease, and characterization testing that includes the elasticity test, concistency test, dropping point test, and four ball test in 1150 rpm. The results of this research are, the bio grease has NLGI #2 with 301 ˚- 317 ˚C in dropping point test. For the antiwear test, the best result is possessed by bio grease with 3.5% of CaCO3 addition with reduction of mass ball bearing as much as 0.7 mg, meanwhile in bio grease with 0% of CaCO3 gave 250 mg reduction of mass ball bearing."

"ABSTRAKPembuatan gemuk bio kalsium kompleks dengan nilai NLGI (National Lubricating Grease Institute) #2 yaitu yang memiliki konsistensi semi-solid akan ditambahkan aditif talc untuk meningkatkan sifat antiwearnya serta mengurangi friksi. Gemuk yang dihasilkan berbahan dasar minyak kelapa sawit dan sabun kalsium kompleks sebagai thickening agent-nya. Sintesis gemuk tersebut dilakukan dengan cara melakukan proses pengadukan, pemanasan, dan reaksi saponifikasi pada suhu maksimum 165oC antara sabun kalsium kompleks secara in situ dalam minyak RBDPO (Refine Bleach Deodorized Palm Oil) yang terepoksidasi pada suhu 65oC. Selanjutnya dilakukan pendinginan dan homogenisasi pada suhu 70oC, serta penambahan aditif talc yang divariasikan komposisinya: 0%, 2,5%, 5%, 7,5%, dan 10% dari berat gemuk. Pengujian karakteristik dari gemuk bio yang dihasilkan meliputi uji konsistensi, uji dropping point dan four ball test dengan kecepatan putaran 1000 rpm. Adapun variable yang terdapat pada penelitian ini yaitu waktu dan suhu selama proses serta ukuran partikel talc sebagai variabel control; komposisi aditif talc sebagai variable bebas; komposisi base oil, thickener agent, dan aditif antioksidan BHT (Butylated Hydroxy Toluene) serta hasil uji karakteristik sebagai variable terikat. Gemuk terbaik yang dihasilkan memiliki sifat antiwear terbaik pada penambahan 2,5% talc dengan jumlah keausan terkecil 0,5 mg, dropping point pada suhu 265oC. Sementara pada penelitian sebelumnya gemuk terbaik yang dihasilkan memiliki jumlah keausan sebesar 0,7 mg pada penambahan 3,5% CaCO3.

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ABSTRACTMaking bio calcium complex grease with NLGI grades (National Lubricating Grease Institute) # 2 is that having a semi-solid consistency will be added talc additives to improve the antiwear properties and reduce friction. Grease generated based palm oil and calcium complex soap as a thickening agent of his. The grease synthesis is performed by the stirring process, heating, and a saponification reaction at a maximum temperature of 165oC between calcium complex soap in situ in the oil RBDPO (Refine Bleach Deodorized Palm Oil) is epoxidized at a temperature of 65oC. Furthermore, the cooling and homogenization at 70°C, and the addition of additives talc varied composition: 0%, 2.5%, 5%, 7.5%, and 10% by weight of fat. Testing characteristics of bio grease produced include test consistency, dropping point test and four-ball test with a rotation speed of 1000 rpm. The variables contained in this research that the time and temperature during the process as well as a variable talc particle size control; talc additive composition as independent variables; the composition of base oil, thickener agent, and antioxidant additives BHT (Butylated Hydroxy Toluene) as well as the characteristics of the test results as the dependent variable. Best bio grease produced has the best antiwear properties on the addition of 2.5% Talc with the smallest amount of wear of 0.5 mg, dropping point at a temperature of 265oC. While previous research has produced the best grease has the amount of wear 0.7 mg on the addition 3.5% CaCO3."

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Penggunaan Biodiesel kelapa sawit sebagai campuran bahan bakar minyak solar semakin meningkat seiring dengan penerapan peraturan pemerintah yang mewajibkan pencampuran biodiesel ke dalam minyak solar sebanyak 20% menjadi biosolar (B-20) pada tahun 2016 dan 30% (B-30) pada tahun 2020. Dilaporkan bahwa penggunaan B-20 menyebabkan penyumbatan pada saringan bahan bakar kendaraan. Penyumbatan disebabkan oleh adanya endapan yang terbentuk dari aglomerasi monogliserida terutama monopalmitin. Adanya endapan ini menurunkan sifat kemudahan alir (flow properties) B-20. Telah dilakukan penelitian untuk memperbaiki flow properties biodiesel dengan penambahan surfaktan Sorbitan Monooleate (SMO). Penambahan SMO pada biodiesel menyebabkan turunnya nilai cold filter plugging point (CFPP) yang dapat menghambat aglomerasi monogliserida. Pada pengujian pengaruh monogliserida terhadap terbentuknya endapan, kadar monopalmitin pada biodiesel divariasikan sebesar 0,4%, 0,5% dan 0,8% massa. Sampel ini dikondisikan pada suhu rendah (16⁰C) selama 24 jam, kemudian dibiarkan pada suhu kamar untuk selanjutnya disaring dan ditimbang endapannya. Semakin tinggi kandungan monogliserida dalam biodiesel, maka semakin banyak endapan yang terbentuk. Penelitian dengan SMO menggunakan biodiesel yang memiliki kandungan monogliserida yang berbeda-beda, yaitu sebesar 0,46% (B-100 A), 0,55% (B-100 B), dan 0,65% massa (B-100 C). Pada setiap biodiesel, penambahan SMO di variasikan 0,1%, 0,5%, dan 1% volume. Penyimpanan sampel biodiesel dikondisikan pada suhu rendah (16⁰C) dan pada suhu ruang (± 27⁰C). Pengaruh SMO terhadap suhu awal pembentukan kristal/wax pada biodiesel dianalisa dengan metode differential scanning calorimetry (DSC), sedangkan pengaruhnya terhadap flow properties dianalisis menggunakan 4 parameter yaitu : viskositas, densitas, titik kabut, dan cold filter plugging point (CFPP). Pengujian dilakukan setiap 1 minggu sekali untuk setiap sampel biodiesel. Penggunaan SMO 0,1% - 1% memperbaiki flow properties dengan menurunkan titik kabut sebesar ± 1,6⁰C dan CFPP sebesar 2⁰C, yang diakibatkan oleh penurunan suhu awal pembentukan kristal dari 10,47⁰C menjadi 6,99⁰C.

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The use of palm oil biodiesel as a mixture of diesel oil fuel is increasing along with the application of government regulations that require mixing biodiesel into diesel oil as much as 20% to biodiesel (B-20) in 2016 and 30% (B-30) in 2020. It was reported that the use of the B-20 caused a blockage in the vehicle's fuel filter. Blockage is caused by the presence of deposits formed from agglomeration of monoglycerides, especially monopalmitin. The presence of these deposits decreases the flow properties of B-20. Research has been carried out to improve the flow properties of biodiesel by adding Sorbitan Monooleate (SMO) surfactant. The addition of SMO to biodiesel causes a decrease in the value of cold filter plugging point (CFPP) which can inhibit agglomeration of monoglycerides. In testing the effect of monoglycerides on the formation of deposits, the level of monopalmitin in biodiesel was varied by 0,4%, 0,5% and 0,8% by mass. This sample is conditioned at a low temperature (16⁰C) for 24 hours, then left at room temperature to then filter and weigh the precipitate. The higher content of monoglycerides in biodiesel, the more deposits are formed. Research with SMO uses biodiesel which has different monoglyceride content, which is 0,46% (B-100 A), 0,55% (B-100 B), and 0,65% mass (B-100 C). In each biodiesel, the addition of SMO is varied by 0,1%, 0,5%, and 1% by volume. Storage of biodiesel samples is conditioned at low temperatures (16⁰C) and at room temperature (± 27⁰C). The effect of SMO on the initial temperature of crystal formation / wax on biodiesel was analyzed by the method of differential scanning calorimetry (DSC), while the effect on flow properties was analyzed using 4 parameters: viscosity, density, cloud point, and cold filter plugging point (CFPP). Tests are carried out every 1 week for each biodiesel sample. The use of SMO 0,1% - 1% improves flow properties by decreasing the cloud point by ± 1.6⁰C and CFPP by 2⁰C, which is caused by a decrease in the initial temperature of the crystal formation from 10,47⁰C to 6,99⁰C.

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"Oil palm empty fruit bunch (OPEFB) is one of the waste products of oil palm plantations and has not been optimally used in Riau Province, Sumatera, Indonesia. OPEFB is reduced by incineration, which causes pollution problems. However, the combustion of OPEFB generates ash, which is rich in potassium. Moreover, OPEFB fiber has good strength, low cost, low density, and biodegradability, and it can be used as composite reinforcement. However, the natural fibers in composites have poor compatibility with the matrix and relatively high moisture absorption. Hydrolysis of OPEFB ash creates a base solution that can be utilized in an alkaline treatment process to increase the mechanical properties of natural composites.The aim of this study was to investigate the effect of various extracts of OPEFB ash on the tensile strength, flexural strength, and water absorption of an OPEFB fiber-polypropylene composite. The experimental design used was the Response Surface Method-Central Composite Design (RSM-CCD). The results showed that the tensile strength increased with an increase of fiber length and concentration of the OPEFB ash extract solution, but tensile strength decreased with a longer soaking time. Flexural strength increased with an increase in fiber length but decreased with an increase in the concentration of the OPEFB ash extract solution and longer soaking time. Water absorption increased with lower and higher concentrations of OPEFB ash extract solution and fiber length and with shorter and longer soaking times. The highest tensile strength (20.100 MPa) was achieved at 5%wt alkaline concentration, 36 h soaking time, and 3 cm fiber length. The highest flexural strength (30.216 MPa) was achieved at 5%wt alkaline concentration, 12 h soaking time, and 3 cm fiber length. The lowest water absorption (0.324%) was achieved at 10%wt alkaline concentration, 24 h soaking time, and 2 cm fiber length."

"Oil palm empty fruit bunch (OPEFB) is one of the waste products of oil palm plantations and has not been optimally used in Riau Province, Sumatera, Indonesia. OPEFB is reduced by incineration, which causes pollution problems. However, the combustion of OPEFB generates ash, which is rich in potassium. Moreover, OPEFB fiber has good strength, low cost, low density, and biodegradability, and it can be used as composite reinforcement. However, the natural fibers in composites have poor compatibility with the matrix and relatively high moisture absorption. Hydrolysis of OPEFB ash creates a base solution that can be utilized in an alkaline treatment process to increase the mechanical properties of natural composites. The aim of this study was to investigate the effect of various extracts of OPEFB ash on the tensile strength, flexural strength, and water absorption of an OPEFB fiber-polypropylene composite. The experimental design used was the Response Surface Method-Central Composite Design (RSM-CCD). The results showed that the tensile strength increased with an increase of fiber length and concentration of the OPEFB ash extract solution, but tensile strength decreased with a longer soaking time. Flexural strength increased with an increase in fiber length but decreased with an increase in the concentration of the OPEFB ash extract solution and longer soaking time. Water absorption increased with lower and higher concentrations of OPEFB ash extract solution and fiber length and with shorter and longer soaking times. The highest tensile strength (20.100 MPa) was achieved at 5%wt alkaline concentration, 36 h soaking time, and 3 cm fiber length. The highest flexural strength (30.216 MPa) was achieved at 5%wt alkaline concentration, 12 h soaking time, and 3 cm fiber length. The lowest water absorption (0.324%) was achieved at 10%wt alkaline concentration, 24 h soaking time, and 2 cm fiber length."

"ABSTRAKTahun 2009, Indonesia memiliki 18 juta Ha lahan yang dapat digunakan untuk perkebunan kelapa sawit dengan luas perkebunan kelapa sawit adalah 7 juta Ha. Seiring dengan semakin meningkatnya produksi dan proyeksi pasar industri sawit Indonesia yang menjanjikan, pabrik kelapa sawit juga menghasilkan peningkatan volume limbah. Namun sayangnya banyak yang tidak mengetahui apa saja potensi limbah kelapa sawit tersebut dan hanya terbuang pada pembuangan akhir sampah. Limbah padat padat kelapa sawit ini dapat berupa tandan kosong, cangkang dan serabut. Limbah cangkang kelapa (oil palm shell) sawit ini diharapkan dapat menjadi agregat kasar menggantikan kerikil untuk menjadikan campuran beton ringan yang nantinya beton OPS ini dapat digunakan sebagai beton struktural sebagai material konstruksi bangunan bukan lagi sebagai campuran percobaan. Penulis akan meneliti penurunan displacement dari beton cangkang kelapa sawit dengan penambahan zat aditif berupa superplasticizer, silica fume, dan fly ash agar mendukung beton cangkang kelapa sawit dapat diaplikasikan pada material konstruksi bangunan. Dengan metode digital image corelation (DIC), displacement yang terjadi pada beton saat menahan beban dapat dilihat dan dianalisis. Analisis gaya displacement yang terjadi diharapkan mendapatkan karakteristik sifat-sifat dari beton ringan OPS seperti stiffness, poisson ratio, untuk mendukung sebagai beton struktural. Mungkin dengan penelitian ini bisa diharapkan beton cangkang kelapa sawit nantnya bisa menjadi beton struktural dalam konstruksi.

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ABSTRACTIn 2009, Indonesia had 18 million hectares of land that could be used for oil palm plantations with an oil palm plantation area of ​​7 million hectares. Along with the increasing production and the promising projection of the Indonesian palm oil market, palm oil mills also produce an increase in the volume of palm oil waste. But unfortunately many people dont know what the potential of oil palm waste, at the end they become wasted in the trash. This solid oil palm waste can be in the form of empty bunches, shells and fibers. This palm oil palm shell (OPS) waste is expected to be able to become coarse aggregates to replace gravel to make lightweight concrete mixtures which later OPS concrete can be used as structural concrete as building construction material not as a trial mixture anymore. The author will analysis load displacement properties of oil palm shell concrete by the addition of additives in the form of superplasticizers, silica fume, and fly ash to support the oil palm shell concrete that can be applied to building construction materials. With the digital image correlation (DIC) method, displacement that occurs in concrete when holding loads can be seen and analyzed. The displacement force analysis that occurs is expected to get the characteristics of the OPS lightweight concrete such as stiffness, poisson ratio, to support as structural concrete. Hopefully with this research, oil palm shell concrete can be the structural concrete in construction."

"Penelitian ini melakukan studi pemanfaatan minyak biji kapuk randu termodifikasi belerang sebagai bahan aditif Extreme Pressure . Bahan baku adalah minyak biji kapuk randu yang di sulfurisasi menggunakan sinar UV dengan panjang sinar 254nm selama 20 jam. Belerang yang digunakan berupa gas H 2S. Minyak biji kapuk randu yang sudah di sulfurisasi diuji kandungan sulfur dan didapat 19875 ppm sulfur selama 20 jam sulfurisasi. Pengujian performa aditif adalah dengan cara uji 4-Ball dengan mencampurkan minyak dasar mineral dengan minyak yang sudah di sulfurisasi selama 20 jam. Parameter yang diuji adalah tingkat ketahanan keausan benda. Hasil uji keausan terbaik adalah pada formulasi minyak dasar mineral + minyak tersulfurisasi 20 jam 10% dengan meningkatkan performa sebesar 97% dari performa minyak dasar mineral. Data diambil pada kondisi operasi alat uji four ball berupa beban/beban 62kg, kecepatan putar 1150 rpm, dan waktu pengujian selama 2 jam.

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This research conducted a study on the use of sulfur-modified kapok seed oil as an Extreme Pressure additive. The raw material is kapok seed oil which is sulfurized using UV light with a light length of 254nm for 20 hours. The sulfur used is H 2S gas. Kapok seed oil that had been sulfurized was tested for sulfur content and obtained 19875 ppm sulfur during 20 hours of sulfurization. Testing the performance of additives is by means of a 4-Ball test by mixing mineral base oil with oil that has been sulfurized for 20 hours. The parameter tested is the level of wear resistance of the object. The best wear test results were in the formulation of mineral base oil + 20 hours 10% sulfurized oil with a performance increase of 97% compared to the performance of mineral base oil. Data was taken under the operating conditions of the four ball test equipment in the form of a load of 62 kg, rotational speed of 1150 rpm, and testing time of 2 hours."