摘要:
A process for purifying a naphthalenic carboxylic acid comprising contacting at a temperature below about 575 °F a mixture comprising an impure naphthalenic carboxylic acid and a solvent in the presence of hydrogen gas with a noble metal on carbon catalyst. The process results in reduced amounts of organic impurities in the purified acid when compared to other purification processes.
摘要:
Disclosed is the use of esters which comprise branched alkyl groups and represent reaction products of alcohols of general formula (I) R1OH, wherein R1 represents a branched alkyl radical containing 10 to 40 C atoms, with a) aliphatic dicarboxylic acids of general formula (II) HOOC-R2-COOH, wherein R2 represents a branched or linear, saturated alkyl radical containing 0 to 34 C atoms, or b) saturated monocarboxylic acids of general formula (III) R3-COOH, wherein R3 represents a branched alkyl radical composed of 3 to 39 C atoms, or c) saturated monocarboxylic acids of general formula (III), wherein R3 represents a linear alkyl radical composed of 3 to 29 C atoms, or d) a mixture of at least two of said acid groups a) to c), as lubricants, provided that the esters comprising branched alkyl groups have an oxidation resistance of at least 1000 hours in an oxidation resistance test (e.g. according to DIN EN ISO 4263-3) and are compatible with sealing materials (e.g. according to ASTM D 471). Also disclosed are lubricants containing the inventive esters that comprise branched alkyl groups at amounts of 0.1 to 99.5 percent by weight relative to the total amount of lubricant.
摘要翻译:一种提高润滑剂的氧化稳定性的方法,包括提供一种或多种含有支化烷基的酯,其是支化醇的反应产物,以及a)一种或多种对应于通式(II)的脂族二羧酸:HOOC-R2-COOH,其中 R2是含有0至34个碳原子的支链或非支链的饱和烷基,或b)对应于通式(III)的一种或多种饱和支链单羧酸:R3-COOH,其中R3是支链烷基, 39个碳原子,或c)一个或多个对应于通式(III)的饱和一元羧酸,其中R 3是3至29个碳原子的直链烷基,或d)其混合物作为润滑剂,条件是 通过根据DIN EN ISO 4263-3的涡轮机油稳定性试验(TOST试验)测定,酯的氧化稳定性为1000小时以上。
摘要:
In one embodiment, the present invention provides a compound comprising formula (I), wherein A = H or OH, X = OH, a halogen, OR, NHR, NR', R'' where R, R', and R'' = H, C1-8alkyl, C2-8alkenyl, or C2-8alkynyl, cycloalkyl, cycloalkenyl, aryl, aralkyl or heterocyclic, substituted or unsubstituted; and R1,R2,R3,R4,R5 = H, C1-8alkyl, C2-8alkenyl, or C2-8alkynyl, cycloalkyl, cycloalkenyl, aryl or heterocyclic, substituted or unsubstituted, wherein R1 includes at least one methylene spacer through which R1 is attached to said compound. The present invention also provides methods for making hydroxynaphthoic acids.
摘要:
Process for the preparation of an aromatic hydrocarbon with a cyclobutene ring fused to the aromatic hydrocarbon which comprises, dissolving an ortho-alkyl halomethyl aromatic hydrocarbon in an inert solvent and pyrolyzing the solution of ortho-alkyl halomethyl aromatic hydrocarbon in the inert solvent under conditions such that the ortho-alkyl and the halomethyl substituents form a cyclobutene ring thereby forming an aromatic hydrocarbon having a fused cyclobutene ring. The ortho-alkyl group has the structural formula (R')2-CH-, wherein R' is separately in each occurance hydrogen or a C1-20 alkyl. The aromatic hydrocarbons with a cyclobutene ring fused to the aromatic hydrocarbon are useful in the preparation of monomers, which are then useful in the preparation of high performance polymers.
摘要:
The present invention pertains to the field of chemical technology, and relates to a clean process of preparing a chloroformyl-substituted benzene. The process of the present invention is done by oxidation of a tail gas hydrogen chloride from a chlorination reaction and a chloroacylation reaction and recycling of the resulting oxidation product chlorine gas into the chlorination reaction. The present invention provides a clean process of preparing a polymer-grade chloroformyl-substituted benzene.
摘要:
A process for purifying a naphthalenic carboxylic acid comprising contacting at a temperature below about 575 °F a mixture comprising an impure naphthalenic carboxylic acid and a solvent in the presence of hydrogen gas with a noble metal on carbon catalyst. The process results in reduced amounts of organic impurities in the purified acid when compared to other purification processes.
摘要:
2-(4-Substitutedphenyl)-2-benzoic acid derivatives, methods for their preparation, pharmaceutical formulations containing the compounds and the use thereof in the reduction or control of blood lipids in animals, including man, are disclosed. The preferred compound is 2-(4-trifluoromethylphenyl)-benzoic acid, which may be administered to man in a dose of about 4 mg/kg bodyweight per day.
摘要:
The present invention pertains to the field of chemical technology, and relates to a clean process of preparing a chloroformyl-substituted benzene. The process of the present invention is done by oxidation of a tail gas hydrogen chloride from a chlorination reaction and a chloroacylation reaction and recycling of the resulting oxidation product chlorine gas into the chlorination reaction. The present invention provides a clean process of preparing a polymer-grade chloroformyl-substituted benzene.