87 results about "Pinacolone" patented technology

The invention discloses a preparation method of tebuconazole. The preparation method using p-chlorobenzaldehyde and pinacolone as initial raw materials comprises the following steps of: obtaining 2-(4-chlorobenzene ethyl)-2-tertiary butyl ethylene oxide through condensation reaction, hydrogenation reaction and epoxidation reaction in sequence; obtaining tebuconazole through ring-opening reaction of 2-(4-chlorobenzene ethyl)-2-tertiary butyl ethylene oxide and triazole under the co-catalysis of organic amine and crown ether. A catalysis technology of a composite catalyst which is composed of organic amine and crown ether is adopted, so that the isomer byproducts in the ring-opening reaction are greatly reduced, the ring-opening yield is improved to 92.8% from 80% of the conventional process, the product quality is improved to 98.5% or higher from 95%, and the total yield (in terms of p-chlorobenzaldehyde) is improved to 82% or higher from 65% of the conventional process.

The invention relates to the field of catalysis, in particular to a method for preparing aryl ketone through reacting aldehyde with aryl boric acid under the catalysis of a ruthenium catalyst. In the method, an organic phosphide is used as a ligand, potassium phosphate is used as alkali, pinacolone or acetone is used as an additive, toluene or/and water is (are) used as a solvent(s), aldehyde and aryl boric acid which are used as reaction substrates react at 95-100 DEG C for 10-24h in the presence of a ruthenium compound used as a catalyst to prepare aryl ketone, wherein the catalyst is one of [Ru(cymene)Cl2]2, [Ru(CO)3Cl2]2, RuH2(CO)PPh3, Ru2(OAc)4, [Ru(benzene)Cl2]2, Ru(S-BINAP)Cl2 or Ru3(CO)12. In the invention, the used catalyst has relatively low price and low toxicity, thereby reducing the preparation cost and being more environmentally friendly.

The invention discloses a method for preparing 2,2,6,6-tetramethyl-3,5-heptanedione, which comprises the process of using alkyl pivalate as a solvent without using other solvents Alkyl pivalate and pinacolone are reacted in the presence of an alkali metal alkoxide catalyst, or they are reacted in an amide type solvent or a urea type solvent in the presence of an alkali metal alkoxide catalyst. Also disclosed is a method for preparing 2,2,6,6-tetramethyl-3,5-heptanedione metal using 2,2,6,6-tetramethyl-3,5-heptanedione complex method. The method for preparing 2,2,6,6-tetramethyl-3,5-heptanedione is an industrialized method, wherein alkali metal alkoxides are easy to handle and can be used as Catalyst for the preparation of 2,2,6,6-tetramethyl-3,5-heptanedione from esters and pinacolones.

The invention discloses a process for preparing pinacolone. The process is characterized by comprising the following steps of: performing condensation reaction of chloro tertpentane and formaldehyde under an acidic condition, and catalyzing by a Zn/Co/Sb compound catalyst, wherein the reaction temperature is 60-95 DEG C and the reaction time is 4-5 hours; the molar ratio of the components in the Zn/Co/Sb compound catalyst is 1:1:1. The process disclosed by the invention has the beneficial effects that the Zn/Co/Sb compound catalyst catalyzes condensation reaction of chloro tertpentane and formaldehyde, so that not only is the process step concise and the process is easy to operate and realize, but also the conversion ratio is high and the reaction time is short. The yield can be improved by 8-15%, and the condensation time can be shortened by over 1/3, so that the production cost is effectively lowered, and the economic benefit is considerable.

The invention relates to a synthesis method of 3, 3-dimethyl-2-butanone by using pivalic acid and glacial acetic acid as raw materials which are catalyzed to react by gas phase under the conditions of normal pressure. The pivalic acid and the glacial acetic acid and water are uniformly mixed up under the normal temperature according to the molar ratio of 1:1:3 to 1:1.4:3; after vaporization, the pivalic acid and the glacial acetic acid and the water are catalyzed to have a decarboxylation reaction and then pinacolone is produced under the normal pressure with the temperature of 380 to 400 DEG C in a fixed bed reactor; the carrier of the catalyst is A12O3; active components are one or two compounds of rare earth metals Ce, Nd, La or oxides thereof; the active component content which is calculated according to the weight of metal oxides takes up 20-30 percent of the weight of the carrier A12O3; the bulk density of the catalyst is 0.47 to 0.5; after analysis, the selectivity of the pinacolone is above 95 percent and then the 3, 3-dimethyl-2-butanone product with the purity of 99 percent can be obtained after the pinacolone is purified by rectification under the normal pressure.

The invention relates to a method for treating high concentration phenolic wastewater. The treating method comprises extracting the high concentration phenolic wastewater with a dephenolization extractant to obtain an extraction phase and a raffinate phase, wherein the dephenolization extractant contains pinacolone, and the high concentration phenolic wastewater contains not less than 2000mg / L of total phenolic contents of phenol. Compared with the prior art, the treating method in the invention is more energy-saving in the solvent recovery stage, and energy consumption of water tower is reduced greatly; and pinacolone has excellent extraction effect, so that the treating method can effectively reduce the content of phenols in the high concentration phenolic wastewater.

The invention relates to a cleaning agent for cleaning a 3D type sand printing head and a preparation method of the cleaning agent. The cleaning agent for cleaning the 3D type sand printing head comprises the following components in percentage by weight: 30-40% of sec-amyl alcohol, 18-26% of tetramethylurea, 18-22% of dipropyl ether, 6-14% of pinacolone, 9-15% of valerone and 0.6-1.4% of a stabilizing agent, wherein the stabilizer is propylene glycol methyl ether. The cleaning agent has the beneficial effects that raw materials relatively mild to human bodies and production environments are selected to reduce harms to the bodies and the environments to the utmost extent; the cleaning agent is small in surface tension and viscosity and strong in osmotic force, and can quickly dissolve resin crystals in the 3D-type sand printing head to ensure that the patency rate of an ore canal in the printing head is not less than 98.5%; the cleaning agent is stable in chemical property and cannot cause swelling and corroding actions on other parts of the printing head; the cleaning agent can reduce the production cost and prolong the service life of the 3D type sand printing head.

The invention relates to a preparation process of pinacolone. The preparation process comprises steps as follows: (1) technical hydrochloric acid is cooled to subzero 5 DEG C to 5 DEG C, isopentene isslowly dropwise added under the stirring condition, the mixture is stirred for 1-3 h after isopentene is dropwise added, and 2-isoamyl chloride is produced; (2) 2-isoamyl chloride is pumped into a condensation reaction kettle, stirring is started, heating is performed slowly, formaldehyde is dropwise added when the temperature of a gas phase reaches 70-80 DEG C, the mixture is kept at the constant temperature for a reaction for 1-2 h after formaldehyde is dropwise added, cooling and still standing for layering are performed after the reaction ends, an upper-layer crude product enters a rectification device at the temperature of 70-80 DEG C for rectification, and a lower-layer acid liquid is pumped into a waste acid distillation kettle for fractionation; (3) rectified pinacolone is sent into a special azeotropic point distillation decoloration device and subjected to decoloration treatment at the temperature of 100-110 DEG C for 2-4 h, and a colorless pinacolone product with the purityhigher than or equal to 98% can be obtained. The preparation process has the advantages as follows: the colorless pinacolone product with the purity higher than or equal to 98% can be prepared.

The invention provides a preparation method of branched alkane, and belongs to the technical field of organic synthesis. The preparation method of the branched alkane comprises the following steps: mixing pinacolone, an alkyl metal reagent and an organic solvent under the condition of a protective atmosphere, performing an alkylation reaction so as to obtain an alkyl alcohol intermediate, mixing the alkyl alcohol intermediate, alkyl silane, an acid catalyst and an organic solvent under the condition of a protective atmosphere, and then performing an elimination reduction reaction so as to obtain the branched alkane. Pinacolone is adopted as a raw material, the alkyl metal reagent is applied to the alkylation reaction so as to obtain the corresponding alkyl alcohol intermediate, the alkyl silane is adopted as a reducing agent of the alkyl alcohol intermediate, and the elimination reduction reaction is performed in the presence of the acid catalyst so as to synthesize the branched alkane. The method has a simple synthesis route, high yield of branched alkane, high purity, no use of expensive catalysts, low raw material cost and simple operation, and is suitable for scale-up and industrial production.

The invention discloses a treatment method for pinacolone chloride production tail gas, comprising the following steps: molecular capture: carrying out molecular capture on the tail gas by using an organic matter capture agent to obtain pinacolone chloride gas in the tail gas; falling film water absorption: absorbing hydrogen chloride gas in the tail gas by adopting a falling film water absorptionmethod to obtain a hydrogen chloride solution; alkali liquor absorption: carrying out alkali liquor absorption on the tail gas subjected to falling film water absorption, and removing unremoved hydrogen chloride gas in the tail gas; and activated carbon adsorption: physically adsorbing the tail gas by activated carbon to adsorb and remove harmful gases in the tail gas. The design is reasonable, and hydrogen chloride and organic gas are separated through molecular capture. Therefore, the difficulty of purifying the waste hydrochloric acid is greatly reduced. Resource reutilization is achievedthrough desorption regeneration, and the capture agent can be recycled, so that the waste gas treatment cost is saved. In addition, after the tail gas from pinacolone chloride production is fully absorbed and treated, the activated carbon treatment load is greatly reduced, and secondary pollution is reduced.

The invention discloses a synthesis method of high-purity pinacolone. The synthesis method of the high-purity pinacolone comprises the following steps: adding isoamylene and 30-39% of hydrochloric acid in zinc chloride as a hydrosilylation catalyst, and reacting at the temperature of 4-8 DEG C to prepare chloro t-pentane; condensing the chloro t-pentane and formaldehyde under an acidic condition, adding a condensation catalyst, and reacting for 5-7 hours at the temperature of 60-95 DEG C to prepare a pinacolone crude product; and adding 8-12% of water in the pinacolone crude product, directly heating and distilling with steam, and rectifying in a rectifying tower. By the method, the problem that a rectifying section is large in energy consumption and low in efficiency is solved, the pinacolone with high content of 98% is increased to be 45% from 15% in total yield, and the rectifying time is shortened to be 12 hours from 16 hours.

The invention discloses a method for preparing high yield pinacolone, and a pesticide bactericide. The pinacolone preparation method is characterized in that pinacolone is synthesized through adopting an isoamyl alcohol technology, hydrochloric acid is adopted as a catalyst, JB is adopted as a polymerization inhibitor, a molar ratio of isoamyl chloride to formaldehyde is 1:1.2-1:1.5, and a condensation reaction is carried out at 60-90DEG C for 6-10h. The method has the advantages of simple process, low requirements on a device, and low cost, and the yield of pinacolone obtained through the method is greater than 85%.

This invention, which involves synthetic method of 5, 5- dimethyl-2, 4-adipaldehyde-0, 0-Boron difluoride, belongs to the field of organic synthesis. Synthetic method of 5, 5-dimethyl-2, 4-adipaldehyde-0, 0-Boron difluoride is to react pinacolone and boron trifluoride diethyl ether at low temperature, and then add aqueous alkaline solution in after treatment to extract product from ether, after that, separate fluid, condense organic phase and final product is obtained. Yield of this method is 2 to 3 times higher than that in literature, and apart from that, mild reaction condition, simple procedures, easy operation, and low cost make it easy for industrial production. The product can be used directly in next step reaction without any special purification.

The invention provides a process system and process for preparing chloropinacolone. The process system comprises a feeding unit, a reaction unit, a purification unit and a post-treatment unit which are connected in sequence, wherein the feeding unit comprises a gas feeding device and a liquid feeding device, the gas feeding device comprises a gas mixing kettle, a first gas storage device and a second gas storage device, the gas mixing kettle is respectively connected with the first gas storage device and the second gas storage device, and the liquid feeding device comprises a first liquid storage bottle and a second liquid storage bottle. The process system has the advantages that reaction and purification of pinacolone and chlorine can be achieved, subsequent treatment of pollutants is achieved, nitrogen can be introduced into the device to dilute chlorine in the reaction period, and what is avoided is that the concentration of chlorine is too large, and by-products are generated.

The invention belongs to the technical field of fine organic synthesis, and particularly relates to a synthesis method of hydroxyl pinacolone retinoate. The method comprises the following steps: (1) adding an organic solvent into retinoic acid, adding an amide catalyst, uniformly stirring, and carrying out ice bath; (2) adding phosphorus trichloride into the material obtained in the step (1) under the protection of nitrogen, and reacting; (3) standing to separate out a lower-layer inorganic solution, adding 1-hydroxy-3, 3-dimethyl butane-2-ketone under an ice bath condition, then adding an acid-binding agent, carrying out heat preservation reaction, carrying out reduced-pressure suction filtration on inorganic salt, and carrying out reduced-pressure concentration on a liquid phase; and (4) adding a recrystallization solvent, cooling and crystallizing to obtain the hydroxypinacolone retinoate. The raw materials and reagents adopted by the invention are common chemical reagents, are low in cost and are easy to obtain; the solvent used in the reaction is toluene, and the next reaction can be carried out without separation and purification; the two-step reaction can be completed in the same kettle, less equipment is used, and the equipment utilization rate is high.

The invention discloses a preparation method of pinacolone. The method includes: (1) isopentene addition reaction: adding isopentene into hydrochloric acid, performing heating for 4-6h to 25DEG C, then further conducting heating to 65DEG C for 4-6h, thus obtaining chloro-tert-pentane; and (2) condensation reaction of chloro-tert-pentane and formaldehyde: adding formaldehyde dropwise into chloro-tert-pentane for 4-6h, and performing heating at the same time to 88-90DEG C, then conducting heat preservation for 1.5-2.5h, and carrying out layering, thus obtaining a pinacolone crude product. The method provided by the invention can achieve high pinacolone yield up to 67% or more.

The present invention discloses a pinacolone preparation method, which comprises that: (1) isoamyl alcohol is dewatered to prepare isoamylene, and the isoamylene and hydrochloric acid are subjected to an addition reaction to obtain chloroisopentane, wherein the reaction temperature is 5-25 DEG C, and the reaction time is 2-8 h; and (2) the chloroisopentane reacts with a methanol solution of sodium methoxide to obtain the pinacolone, wherein the reaction temperature is 0-60 DEG C, and the reaction time is 15-35 min. According to the present invention, the method has characteristics of simple process, low equipment requirement and low cost, and the purity of the product obtained through the method is more than or equal to 99.8%.

A family of electrolytes for use in a lithium ion battery. The genus of electrolytes includes ketone-based solvents, such as, 2,4-dimethyl-3-pentanone; 3,3-dimethyl 2-butanone(pinacolone) and 2-butanone. These solvents can be used in combination with non-Lewis Acid salts, such as Li₂[B₁₂F₁₂] and LiBOB.

The invention discloses a green method for preparing pinacolone, and belongs to the technical field of a fine chemical engineering intermediate. A trioxymethylene (or paraformaldehyde) hydrochloric acid water solution and isoamylene is continuously fed in different positions in a reaction rectifying tower; pinacolone crude products and a hydrochloric acid mixed solution are continuously dischargedat the bottom; organic phases and water phases are continuously separated; the organic phases are distilled to obtain a pinacolone finished product; previous fractions enter trioxymethylene (or paraformaldehyde) and acid water phases return for preparing a trioxymethylene (or paraformaldehyde) acid solution. A set of reaction rectifying tower is used; three-step reaction is controlled to be performed in different positions in one system; three wastes (waste water, waste gas and waste solid) are reduced; the number of personnel is reduced; the equipment utilization rate is improved; the methodbelongs to a green, environment-friendly safe novel process.

The invention provides a production method for chloropinacoline, which includes the following steps: after pinacolone and chlorine are subjected to chlorination reaction under the catalysis of methanol, methanol is recovered by desolvation, so that crude chloropinacoline is obtained; and the crude chloropinacoline is kept still to be layered, so that a lower final product, chloropinacoline, is obtained. The advantages of the production method for chloropinacoline are as follows: the yield of product is high, the purity is high, and the efficiency of production is high.