1450 results about "Malonic acid" patented technology

Organisms are provided which express enzymes such as glycerol dehydratase, diol dehydratase, acyl-CoA transferase, acyl-CoA synthetase β-ketothiolase, acetoacetyl-CoA reductase, PHA synthase, glycerol-3-phosphate dehydrogenase and glycerol-3-phosphatase, which are useful for the production of PHAs. In some cases one or more of these genes are native to the host organism and the remainder are provided from transgenes. These organisms produce poly (3-hydroxyalkanoate) homopolymers or co-polymers incorporating 3-hydroxypropionate or 3-hydroxyvalerate monomers wherein the 3-hydroxypropionate and 3-hydroxyvalreate units are derived from the enzyme catalysed conversion of diols. Suitable diols that can be used include 1,2-propanediol, 1,3 propanediol and glycerol. Biochemical pathways for obtaining the glycerol from normal cellular metabolites are also described. The PHA polymers are readily recovered and industrially useful as polymers or as starting materials for a range of chemical intermediates including 1,3-propanediol, 3-hydroxypropionaldehyde, acrylics, malonic acid, esters and amines.

The present invention discloses trivalent chromium color zinc coating passivator for passivation at normal temperature and its preparation process. The trivalent chromium color zinc coating passivator includes Cr3+ 1-7.5g/L, molybdate 1-25g/L, cobalt sulfate 5-15, ammonium bifluoride 1-8g/L, malonic acid 1-12g/L, phosphate 1-12 g/L, and silicate 0.2-6g/L. The trivalent chromium color zinc coating passivator solution has pH 1.8-2.3 regulated with sodium carbonate or nitric acid, passivating temperature of 20-35deg.c, passivating time of 30-60 sec and stoving temperature of 70-80deg.c. The present invention has the advantages of being practical and good use effect.

The invention relates to porous carbon with high-volumetric-specific-capacitance composite graphene, a preparation method thereof, and an application thereof. The porous carbon comprises the raw materials of graphene oxide, hydroxyl-containing phenols and derivatives thereof (phenol, resorcinol, phloroglucin, p-hydroxybenzoic acid, or 2,4-dihydroxybenzoic acid), and aldehydes (formaldehyde, butyraldehyde, or terephthalaldehyde). A carboxyl-containing compound (amphoteric compound amino acid, malonic acid, or oxalic acid) is used for regulating the pH value of the system and for initiating a phenolic condensation polymerization reaction, such that a sandwich structure with nano-sheets embedded in a polymer is prepared. The structure is subjected to carbonization, and the porous carbon is prepared with a one-step method. The prepared porous carbon with the sandwich structure is advantaged in novel structure, simple preparation technology, high product purity, convenient application, and suitability for large-scale productions. The porous carbon shows a mass specific capacitance similar to that of a graphene-based material in the application in a super-capacitor. Also, the volumetric specific capacitance of the porous carbon is higher by a magnitude than that of the graphene-based material. Therefore, the porous carbon has great application potential and market prospect.

The invention relates to an antibacterial biological activity stent and a preparation method thereof. The method comprises the steps that gelatin microspheres are prepared; porous gelatin microspheres are prepared; gelatin microspheres carried with active factors are obtained; an antibacterial stent is prepared, wherein the preparation of the antibacterial stent comprises the steps that at least one of collagen, chitosan and silk fibroin and nano-silver grains are added to acetic acid or malonic acid to prepare a mixed solution, the mixed solution is poured into a die which is horizontally paved with the solid gelatin microspheres, the die is rapidly placed in an ultra cold refrigerator for freezing treatment, and the die is frozen and dried to obtain the antibacterial stent; and the antibacterial biological activity stent is prepared by the steps that the gelatin microspheres carried with the active factors are placed into normal saline to prepare a suspension liquid, and the suspension liquid is poured into the antibacterial stent to obtain the antibacterial biological activity stent after dried at the room temperature. According to the antibacterial biological activity stent and the preparation method thereof, pure natural polymers are taken as raw materials, the nano-silver grains and the bioactive factors are compounded to prepare the stent, so that the stent has the biological activity and antibacterial capacity, can effectively promote vascularization of cambium and can be used for skin injury healing.

A polishing composition includes fumed alumina, alumina other than fumed alumina, colloidal silica, a first organic acid, a second organic acid, an oxidizing agent, and water. When the second organic acid is citric acid, the first organic acid is preferably malic acid, while when the second organic acid is malic acid, the first organic acid is preferably citric acid. When the second organic acid is succinic acid, iminodiacetic acid, itaconic acid, maleic acid, malonic acid, crotonic acid, gluconic acid, glycolic acid, lactic acid, or mandelic acid, the first organic acid is preferably either citric acid or malic acid. The polishing composition can be suitably used for polishing the surface of a substrate for a magnetic disk.

Disclosed is a 700V high-voltage aluminum electrolytic capacitor electrolyte. The electrolyte comprises 50-80% of main solvent, 20-50% of auxiliary solvent, 5-20% of main solute, 2-10% of auxiliary solute, 0.1-1% of auxiliary additive and 5-15% of spark additive, wherein the main solute comprises one or more of azelaic acid, ammonium hydrogen azelate, ammonium sebacate, decane dicarboxylic acid, 7, 9-dimethyl-7, 9-dimethoxy carbonyl-1, 11-dodecane dicarboxylic acid, and 7, 8-dimethyl-7, 8-dimethoxy carbonyl-1, 14 tetradecane dicarboxylic acid; and the auxiliary solvent comprises one or more of ammonium salicylate, salicylic acid, oxalic acid, malonic acid, succinic acid, ammonium benzoate, ammonium maleate, ammonium hydrogen maleate, ammonium adipate and hexanedioic acid. The spark voltage of the electrolyte is greater than 700V; and in addition, the electrolyte is simple to prepare, stable in performance and excellent in related parameters.

The invention discloses a preparation method 2,4,5-trifluorophenylacetic acid. The method is characterized by consisting of four reaction steps of: A, reaction of 2,4,5-trifluoronitrobenzene (I) and diethyl malonate which are condensed to prepare 2,5-difloro-4-nitrobenzophenone diethyl malonate; B, hydrolysis, acidification and decarboxylic reaction of dibasic ester; C, reduction reaction of nitryl; and D, diazotization fluoridation of amino. The four reaction steps can be sequentially carried out according to A, B, C and D, or A, C, B and D, or A, C, D and B. According to the preparation method provided by the invention, condensation of 2,4,5-trifluoronitrobenzene (I) and diethyl malonate is easy to realize by means of high substituting activity of nitryl p-fluorine, and the raw material 2,4,5-trifluoronitrobenzene (I) is low in cost and easy to obtain and can be easily prepared by nitration and fluorination of 2,4-dichlor fluorbenzene. Compared with the prior art, the preparation method provided by the invention has the characteristics of low-cost and easily obtained raw materials, mild reaction condition, high total yield, low production cost and the like, and is comparatively suitable for industrialized production.

The invention relates to a prediction method of ammonia release amount in main stream smoke of flue-cured tobacco leaves. The method comprises the steps of subjecting tobacco leaves to be cured firstly to sample pre-processing such as manual piece tearing, stalk removing and tobacco cutting; detecting 8 chemical components (total nitrogen, rutin, chlorine, belladonna, linolenic acid, malonic acid, potassium and linoleic acid) of a sample to be detected; calculating network values of 7 nodes of a hidden layer according to the detection results of the 8 chemical components and coefficients of input layers of a model; converting the network values of the 7 nodes of the hidden layer to output values of the 7 nodes of the hidden layer; and calculating to obtain a predicted value of the ammonia release amount in the smoke according to the output values of the 7 nodes of the hidden layer and coefficients of output layers of the model. According to the method, the ammonia release amount in the smoke can be predicted through the model, and the possible ammonia accumulated content in cigarette finished products produced in future can be predicted effectively according to raw materials of the flue-cured tobacco leaves, so that raw material choosing in a producing process is guided.