摘要:
The present invention relates to an improved process for the regeneration, by thermal cracking, of a mixture of heavy byproducts (residues) resulting from a unit for the production of acrylic acid and from a unit for the production of acrylic ester, resulting in acrylic acid, acrylic esters and alcohols being obtained, for the purpose of recycling them in the plant for the production of the acrylic ester.
摘要:
The present invention relates to a process for the preparation of dimethyl fumarate, a compound of formula I, in a purity of at least 99.0% as determined by HPLC, containing less than 400 ppm of an anion of a mineral acid and less than 5 ppm of dimethyl maleate.
摘要:
A batchwise process for aftertreatment of polyol esters prepared by reacting polyols of the general formula (II) H—(—O—[—CR1R2—]m—)o—OH (II) in which R1 and R2 are each independently hydrogen, an alkyl radical having 1 to 5 carbon atoms, preferably methyl, ethyl or propyl, or a hydroxyalkyl radical having 1 to 5 carbon atoms, preferably the hydroxymethyl radical, m is an integer from 1 to 10, preferably 1 to 8 and especially 1, 2, 3 or 4, o is an integer from 2 to 15, preferably 2 to 8 and especially 2, 3, 4 or 5, with excess linear or branched aliphatic monocarboxylic acids having 3 to 20 carbon atoms and having a lower boiling point than the polyols used. The process is carried out in the presence of a Lewis acid and in the presence of an adsorbent, while removing the water formed, characterized in that the excess monocarboxylic acid is removed by distillation and water is added to the crude ester obtained at a temperature below the boiling point of water at the particular pressure and the crude ester with added water is aftertreated with avoidance of basic compounds, and the sparingly soluble conversion products and the adsorbent present in the esterification reaction are filtered off.
摘要翻译:用于后处理多元醇酯的分批方法,其通过使通式(II)的多元醇H - ( - O - [ - CR 1 R 2 - ] m - )o-OH(II)反应制备,其中R 1和R 2各自独立地为氢, 具有1至5个碳原子的烷基,优选甲基,乙基或丙基,或具有1至5个碳原子的羟烷基,优选羟甲基,m为1至10,优选1至8,特别是1,2 ,3或4,o是2至15,优选2至8,特别是2,4或5的整数,其中具有3至20个碳原子并具有比其低的沸点的过量的直链或支链脂肪族单羧酸 使用多元醇 该方法在路易斯酸存在下并且在吸附剂存在下进行,同时除去形成的水,其特征在于通过蒸馏除去过量的单羧酸,并将水加入到在低于 在特定压力下的水的沸点和加入水的粗酯进行后处理,避免碱性化合物,并且滤出酯化反应中存在的微溶的转化产物和吸附剂。
摘要:
A batchwise process for aftertreatment of polyol esters prepared by reacting polyols of the general formula (II) H—(—O—[—CR1R2—]m—)o—OH (II) in which R1 and R2 are each independently hydrogen, an alkyl radical having 1 to 5 carbon atoms, preferably methyl, ethyl or propyl, or a hydroxyalkyl radical having 1 to 5 carbon atoms, preferably the hydroxymethyl radical, m is an integer from 1 to 10, preferably 1 to 8 and especially 1, 2, 3 or 4, o is an integer from 2 to 15, preferably 2 to 8 and especially 2, 3, 4 or 5, with excess linear or branched aliphatic monocarboxylic acids having 3 to 20 carbon atoms and having a lower boiling point than the polyols used. The process is carried out in the presence of a Lewis acid and in the presence of an adsorbent, while removing the water formed, characterized in that the excess monocarboxylic acid is removed by distillation and water is added to the crude ester obtained at a temperature below the boiling point of water at the particular pressure and the crude ester with added water is aftertreated with avoidance of basic compounds, and the sparingly soluble conversion products and the adsorbent present in the esterification reaction are filtered off.
摘要翻译:用于后处理多元醇酯的分批方法,其通过使通式(II)的多元醇H - ( - O - [ - CR 1 R 2 - ] m - )o-OH(II)反应制备,其中R 1和R 2各自独立地为氢, 具有1至5个碳原子的烷基,优选甲基,乙基或丙基,或具有1至5个碳原子的羟烷基,优选羟甲基,m为1至10,优选1至8,特别是1,2 ,3或4,o是2至15,优选2至8,特别是2,4或5的整数,其中具有3至20个碳原子并具有比其低的沸点的过量的直链或支链脂肪族单羧酸 使用多元醇 该方法在路易斯酸存在下并且在吸附剂存在下进行,同时除去形成的水,其特征在于通过蒸馏除去过量的单羧酸,并将水加入到在低于 在特定压力下的水的沸点和加入水的粗酯进行后处理,避免碱性化合物,并且滤出酯化反应中存在的微溶的转化产物和吸附剂。
摘要:
The present invention relates to an ester for refrigerator oils having less remaining by-products in the ester and having high thermal stability, and a method for producing the ester for refrigerator oils. The ester for refrigerator oils is obtained by treating a crude ester product, which is obtained by reacting a neopentyl polyol having a carbon number of 5 to 10 with an aliphatic carboxylic acid having a carbon number of 4 to 12, with one or more kinds of salts selected from the group consisting of sulfite, bisulfite, and pyrosulfite.
摘要:
The present invention relates to a new method for isolating ingenol (C20H28O5) from mixtures of diterpenoid esters and ingenol esters in a single step. Ingenol isolated by means of this method can be used as a precursor for the synthesis of biologically active ingenol derivatives, such as ingenol-3-angelate and ingenol-3-tigliate.
摘要翻译:本发明涉及一步法分离二烯酚(C 20 H 28 O 5)与二萜酯和烯醇酯的混合物的新方法。 通过该方法分离的原基因可以用作合成生物活性的异氰酸酯衍生物的前体,例如西内醇-3-天冬氨酸和内酯-3-叶酸酯。
摘要:
The present invention provides a method of recovering a (meth)acrylic acid ester, which comprises the steps of: (a) carrying out an esterification reaction between an alcohol and (meth)acrylic acid in the presence of a catalyst to obtain a (meth)acrylic acid ester, wherein a byproduct is generated together with the (meth)acrylic acid ester; and (b) subjecting the byproduct generated in step (a) to a reaction with a catalyst and water in a reactor, wherein the water is fed into the reactor in order that water content exceeds 0 wt % but is 10 wt % or less in the reactor based on the total weight of reactants comprising the byproduct, the catalyst and the water, and thereby separating the (meth)acrylic acid, the alcohol and the (meth)acrylic acid ester contained in the byproduct from the byproduct to obtain the (meth)acrylic acid, the alcohol and the (meth)acrylic acid ester as a recovered product.
摘要:
The present invention includes methods for producing and purifying esters of polyunsaturated fatty acids that include reacting a composition having triglycerides with polyunsaturated fatty acid residues in the presence of an alcohol and a base to produce an ester of a polyunsaturated fatty acid from the triglycerides. The composition can be a polyunsaturated fatty acid-containing composition that has not been conventionally processed. The reacted composition can be further processed by distillation.
摘要:
A carrier for use for separation purpose and a method for separation of a compound enable a chemical reaction to be performed in a liquid phase, a compound of interest to be separated from the liquid phase after the completion of the reaction readily, the separated compound to be evaluated by structural analysis or the like while the compound is being bound to the carrier, and the compound to be separated from the carrier readily. A carrier for separation is also provided which has a reaction site capable of reacting with other compound(s) on a benzene ring, and a long-chain group having a specified carbon atom(s) at each of the ortho-position and the para-position of the reaction site through an oxygen atom.
摘要:
An industrially advantageous method for producing a high purity terminal olefin is disclosed, comprising the steps of (a) contacting a mixture comprising a terminal olefin represented by formula (1): and one or more corresponding internal olefins as impurities, with a brominating agent in the presence of water or an alcohol, to convert the internal olefin(s) to compound(s) having a higher boiling point than the terminal olefin; and (b) purifying the terminal olefin by distillation from the reaction mixture.