79 results about "Carboxylic acid synthesis" patented technology

Disclosed is a process that relates to the recovery of a metal catalyst from an oxidizer purge stream produced in the synthesis of carboxylic acid, typically terephthalic acid. The process involves the addition of a wash solution to a high temperature molten dispersion to recover the metal catalyst and then subjecting an aqueous mixture or purified aqueous mixture so formed to a single stage extraction to remove organic impurities to produce an extract stream and a raffinate stream comprising the metal catalyst.

A process is disclosed that relates to the recovery of a metal catalyst from an oxidizer purge stream produced in the synthesis of carboxylic acid, typically terephthalic. More particularly, the process involves recovery of a metal catalyst from an oxidizer purge stream through the use of a pressure filter, the combining of water with a mother liquor to recover the metal catalyst and then subjecting an aqueous mixture so formed to a single stage extraction with an extraction solvent to produce an extract stream comprising organic impurities and a raffinate stream comprising the metal catalyst.

The invention discloses a method for preparing flame-retarding ultraviolet curing aqueous polyurethane coating and belongs to the technical field of ultraviolet curing aqueous polyurethane coating. The preparation method comprises: synthesizing phosphorized polyester polyol by using dicarboxylic acid, diol and phosphonate polycarboxylic acid; mixing the obtained phosphorized polyester polyol, diisocyanate and a catalyst, reacting to obtain isocyanate-terminated phosphorized polyurethane prepolymer, directly adding polyhydroxyl carboxylic acid, and performing chain extension reaction to obtainphosphorized polyurethane prepolymer; and terminating the phosphorized polyurethane prepolymer by using hydroxyethyl methacrylate or hydroxypropyl acrylate, neutralizing by using an amine compound, diluting with water, stirring, emulsifying and adding photoinitiator to obtain the flame-retarding ultraviolet curing aqueous polyurethane coating. When the method is used, the aqueous polyurethane dispersion has internal flame-retarding performance and radiation curing performance and the application range of the aqueous polyurethane is expanded greatly.

This patent pertains to selective inhibition of assembly of the membrane attack complex of complement by use of less than 1 kDa molecular weight forms of the aurin tricarboxylic acid synthetic complex (ATAC), and their derivatives. It further pertains to the use of these materials to treat human conditions where there is evidence of self destruction of host tissue by the membrane attack complex. These diseases include, but are not limited to, Alzheimer disease, age related macular degeneration, and atherosclerosis.

The invention relates to a synthetic multiple-effect lubricant additive and a preparation method thereof and in particular relates to a fully-synthetic multiple-effect lubricant additive which does not contain S and Cl and takes a metal processing lubricant as a main product. The fully-synthetic multiple-effect lubricant additive is a mixture containing glycerol single ricinoleate, a carboxylic acid synthetic ester lubricant, iso-tridecanol polyoxyethylene ether, an antirust agent, amine phosphate, a non-ferrous metal corrosion inhibitor and a carboxyl hexyl-2-cyclohexene-1-octadeca-carbonic acid. The fully-synthetic multiple-effect lubricant additive has the advantages of good wear resistance, good anti-rust performance, good synergy and environmental friendliness. The fully-synthetic multiple-effect lubricant additive is applicable to blending emulsified oil, micro-emulsifying liquid, fully-synthetic metal working fluid, metal rolling liquid and metal molding working fluid as well as lubricating oil products such as water-based fire-resistant hydraulic oil.

The present invention discloses a ceftezole acid preparation method, which comprises four steps such as 7-amino-8-oxo-3-[(1,3,4-thiadiazol-2-ylthio)methyl]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2??-carboxylic acid synthesis, carboxyl protection, anhydride preparation and ceftezole acid generation. The ceftezole acid preparation method has the following advantages that: the carboxyl of the synthesized 7-amino-8-oxo-3-[(1,3,4-thiadiazol-2-ylthio)methyl]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2??-carboxylic acid is protected, such that complex impurity formation during ceftezole acid generation through the reaction of the 7-amino-8-oxo-3-[(1,3,4-thiadiazol-2-ylthio)methyl]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2??-carboxylic acid and the anhydride is avoided so as to increase yield and reduce cost, wherein the total yield (calculated as a mass ratio of ceftezole acid to 7-ACA) is 130% ( the total yield=the mass of ceftezole acid/the mass of 7-ACA).

The invention discloses a tert-carboxylic acid synthesis method. According to the method, olefin and carbon monoxide serve as raw materials, and a tert-carboxylic acid product is obtained through catalyzed synthesis under normal pressure or low pressure in the presence of strongly acidic ionic liquid-metal carbonyl complex catalyst. Corrosion is avoided, catalyst consumption is low, three-waste discharge is low, the tert-carboxylic acid product and the catalyst can be separated easily after reaction ends, and the defects of existing technologies that separation effect is poor and dilute sulphuric acid recovery is hard are overcome.

The invention discloses a method for synthesizing alpha-hydroxycarboxylic acid metallic soap by hydrolysis of an alpha-halogenated carboxylic acid and belongs to the field of organic compound synthesis. The method is characterized in that a cheap and easily available alpha-halogenated carboxylic acid especially such as an alpha-chlorinated fatty acid undergoes a hydrolysis reaction in the presence of a neutral or alkalescent solid acid-binding agent and a catalyst under hydro-thermal conditions so that the corresponding alpha-hydroxycarboxylic acid metallic soap is synthesized. The method has simple and environmentally friendly processes, adopts cheap and easily available raw materials, reduces less side reactions and has a high product yield.

The invention relates to recombinant corynebacterium glutamicum, a method for constructing the recombinant corynebacterium glutamicum and a method for producing tetrahydropyrimidine by using the recombinant corynebacterium glutamicum. Compared with wild corynebacterium glutamicum, the recombinant corynebacterium glutamicum has phosphoenolpyruvate carboxylase, homoserine dehydrogenase and dihydropyrimidinedicarboxylate synthetase with reduced expression level, and also has a gene expression cassette for expressing phosphoenolpyruvate carboxylase and a gene expression cassette for expressing ectA enzyme, ectB enzyme and ectC enzyme, so that tetrahydropyrimidine can be efficiently produced. The tetrahydropyrimidine produced by using the recombinant corynebacterium glutamicum has high yield, the safety of tetrahydropyrimidine products is improved, the production cost is greatly reduced, and the recombinant corynebacterium glutamicum has good market application prospect.

Disclosed are methods for removing rust from a ferrous metal-containing surface. These methods include contacting the surface with a composition that includes a carboxylic acid, a synthetic hectorite clay, and water.

The present invention relates to a (S)-2-methyl-1,4,5,6-tetrahydromethylpyrimidine-4-carboxylic acid synthesis method. According to the method, L-glutamine is used as a raw material, the alpha-amino of the L-glutamine is protected with a protection group, a decarbonylating agent is added, a Hofmann degradation reaction is performed to remove the carbonyl group attached to the remaining amino, the protection group is removed to obtain L-2,4-diaminobutyric acid, and finally the prepared L-2,4-diaminobutyric acid and trimethyl orthoacetate are subjected to a ring forming reaction to obtain the (S)-2-methyl-1,4,5,6-tetrahydromethylpyrimidine-4-carboxylic acid. Compared to the method in the prior art, the method of the present invention has the following characteristics that the chemical synthesis route is provided, the steps of the synthesis process are simple, the raw materials are easy to obtain, the product purity is high, and the method is suitable for large-scale industrial production.

The invention discloses a raw material drying device for 7-chloro-6-fluoro-1-cyclopropyl-1,4-dihydro-4-oxo-3-quinoline carboxylic acid synthesis. A drying box is included, and a fixed plate is weldedto the inner wall of one side of the drying box; the side wall of one side of the fixed plate is provided with a groove; the side wall of one side of the groove is connected with a slider in a slidingmanner; a spring connected with the side wall of the top end of the groove is installed at the top end of the slider; a filtering net is hinged to the side wall of one side of the slider; the other end of the filtering net is hinged to the inner wall of the drying box; a triangular plate is welded to the bottom end of the slider; a driving motor connected with the side wall of the groove is installed below the triangular plate; the output end of the driving motor is connected with a rotating shaft; a rotating disk is welded to the end, away from the driving motor, of the rotating shaft; and aconical plate is welded to the side wall of the rotating disk in the axis direction array direction of the rotating disk. Due to the raw material drying device for 7-chloro-6-fluoro-1-cyclopropyl-1,4-dihydro-4-oxo-3-quinoline carboxylic acid synthesis, drying treatment can be fast performed on raw materials for 7-chloro-6-fluoro-1-cyclopropyl-1,4-dihydro-4-oxo-3-quinoline carboxylic acid synthesis, drying can be performed on the two sides of the raw materials at the same time, the raw materials can be shaken in drying, the raw materials are heated uniformly, and the drying effect and efficiency are improved.

The invention discloses organic liquid crystal friction modifiers with alkyl end chains and a preparation method of the organic liquid crystal friction modifiers. According to the preparation method,p-hydroxybenzoic acid and hydroquinone are subjected to an esterification reaction to obtain an intermediate product A, and the intermediate product A is subjected to an esterification reaction with straight-chain carboxylic acids having different carbon chain lengths (wherein a carbon number is in a range of 5 to 21) to obtain compounds as shown in the formula (I). The series of phenyl terephthalate compounds with the alkyl end chains having different lengths are synthesized from three benzene rings connected via ester groups and long-chain n-carboxylic acid; and through the synergistic effect of the polarity of the ester groups, the oil solubility of long-chain alkyl groups, the rigidity influence of the three benzene rings of the compounds and the specific lubricating properties of liquid crystal materials of the compounds, the series of compounds have the performance suitable for being used as lubricating grease additives.

A method for biosynthesis of polymer precursors, including, adipic acid, 1,6-hexanediol, 6-hydroxyhexanoic and 6-aminocaproic acids from carboxylic acids is provided. A method for biosynthesis of adipic acid from six-carbon dicarboxylic acids having α, β-enoate reductase activity by treatment with an enzyme is provided. The biocatalytic conversion of aliphatic and hydroxycarboxylic acids to corresponding aldehydes, alcohols, and amines using novel carboxylate reductases, aldehyde reductases, and aminotransferases is described. Also provided are genetically engineered microorganisms for use in the biosynthetic processes.

The invention relates to a preparation method of reversible covalent cross-linked reprocessable epoxy resin containing thioester bonds. The preparation method comprises the following steps: firstly, synthesizing an epoxy curing agent containing a reversible covalent bond-thioester bond by utilizing acid anhydride and mercaptocarboxylic acid, then mixing the epoxy curing agent with an epoxy monomer, and curing epoxy at a specific temperature to obtain the epoxy resin capable of being reprocessed for multiple times. The epoxy curing agent is simple to synthesize, easy to operate and wide in rawmaterial source. And the synthesized epoxy curing agent can be used for various epoxy monomers. Because the dynamic covalent bond thioester bond can be subjected to dynamic exchange reaction, the cured epoxy resin not only has excellent mechanical properties, but also has excellent reprocessing properties.

The invention relates to a synthetic method of indan-1-carboxylic acid which is a pharmaceutical raw material for clidanac. The synthetic method comprises the following steps: (1) o-bromobenzyl bromide is taken as a starting raw material and reacted with zinc powder, thereby obtaining o-bromobenzyl zinc bromide; (2) the carbon cyclization reaction is carried out on the o-bromobenzyl zinc bromide and an acrylic acid ester compound under the action of a catalyst, thereby obtaining an indan-1-carboxylic acid compound; and (3) the indan-1-carboxylic acid compound is hydrolyzed under the alkaline condition, thereby obtaining the indan-1-carboxylic acid which is the important pharmaceutical raw material for synthesizing the clidanac. The synthetic method can rapidly and simply synthesize the indan-1-carboxylic acid, thereby shortening the synthesis route of the clidanac and further reducing the production cost of the clidanac.

The invention relates to lycoris plant lycoris aurea 1-aminocyclopropane-1-carboxylic acid synthetase as well as a coding gene and application thereof. The lycoris plant lycoris aurea 1-aminocyclopropane-1-carboxylic acid synthetase is disclosed for the first time, and has good enzymatic activity and can catalyze adenosyl methionine to synthesize the 1-aminocyclopropane-1-carboxylic acid. The invention also discloses a polynucleotide for coding the 1-aminocyclopropane-1-carboxylic acid synthetase, a vector and a host cell for expressing the 1-aminocyclopropane-1-carboxylic acid synthetase, and a method for producing the 1-aminocyclopropane-1-carboxylic acid by using a whole-cell transformation method.

The invention relates to a preparation method for a carboxylic acid molecule, specifically to a photosensitive carboxylic acid molecule, and a preparation method and application thereof. According to the invention, 5-hydroxyl-nitrobenzaldehyde is used as a starting material to prepare o-nitrobenzyl-containing fatty acid through simple unit synthesis; light-degradable-unit-containing carboxylic acid is prepared through simple standard organic unit reactions like etherification, reduction and esterification; meanwhile, the method in the invention uses cheap raw materials and has simple synthetic process, so the photosensitive carboxylic acid molecule with different structures can be prepared with low cost; and an obtained target product can reach a level of hectogram and realize the purity of more than 98% through simple crystallization. In addition, the invention also discloses the application of the photosensitive carboxylic acid molecule in drug sustained release; meanwhile, drug-loading and photocontrolled release capacities of photosensitive phospholipid vesicles synthesized from light-degradable carboxylic acid prove that the photosensitive carboxylic acid molecule has good photoresponse performance.