Process of producing trihydroxy methyl propane trimethyl acrylate with low chroma

The present invention relates to process of producing trimethylol propane trimethyl acrylate with low chroma. In the presence of catalyst and polymerization inhibitor, methacrylic acid and trimethylolpropane produce esterification directly while adding waterborne agent; and the resultant is then distilled in a distillation kettle or distillation tower with copper net stuffing or copper net supported ceramic stuffing and polymerization inhibitor set in the reflux liquid collecting tank. The present invention has high product yield, low production cost, chroma lower than that of No. 40 Pt-Co color code, and other advantages.

Method for producing trioctyl trimellitate with trimellitic acid

The invention relates to a method for producing trioctyl trimellitate through using trimellitic acid. Intermediate products of trimellitic acid and methanol in the process of producing the trimellitic anhydride are esterified to generate trimethyl trimellitate; the trimethyl trimellitate and 2-ethylhexanol (commonly called asoctanol) are subjected to ester exchange to produce trimellitate (2-ethyl) trihexyl ester (trioctyl trimellitate). The method of methyl esterification and ester exchange can reduce requirement on a technology and equipment so that the intermediate product of the trimellitic acid in the process of producing the trimellitic anhydride is flexibly utilized.

Method for producing meta benzene tricarbonic acid through sequential oxidation by using intermittent multiple cascaded Bubbling oxidation towers

Method for concentrating at low temperature and pretreating concentrated solution

The invention relates to a method for concentrating at low temperature and pretreating concentrated solution. The method mainly comprises the following steps: 1, preparing mass percentage of formaldehyde solution for reacting to be between 3 and 15 percent; 2, adding frozen diluted formaldehyde solution into a concentration autoclave; 3, adding n-butyl aldehyde and alkali metal hydroxide solutioninto the autoclave by two parts for two times; 4, dripping methanoic acid into concentrated solution; 5, pumping the acidified concentrated solution into a formaldehyde stripping tower to remove formaldehyde, methanol and partial water; and 6, pumping distillate into a dealcoholizing tower if the mass percentage of the methanol in the distillate obtained in the step five exceeds 2 percent, and distilling the methanol thereinto under normal pressure condition. The concentrated solution obtained through low temperature concentration, step feed and pressurized formaldehyde stripping/dealcoholizing ...

Process of refining trimethylolpropane

Process for producing oxyalkylated trihydroxy methyl-propane

Method for producing propylene glycol mono-methyl ether with energy conservation

The invention relates to a method for producing propylene glycol mono-methyl ether with energy conservation, which comprises the following steps: mixing propylene epoxide, methanol and a catalyst (sodium methoxide or potassium methoxide) in a preset ratio in a static mixer; preheating to a set temperature with vapor generated by absorbing reaction heat in a preheater; heating with foreign vapor with the temperature higher than 160DEG C in a heater for pre-reaction; continuously reacting materials in a tube pass of a pressureproof tube type heat exchanger; vaporizing hot water in a shell pass with surplus heat released in the reaction; and performing the subsequent routine refining process of separation and purification on materials on the outlet of the tube pass of the tube type heat exchanger to produce the propylene glycol mono-methyl ether. The method can timely remove heat released in etherification, the heat is converted to a heat source for preheating the raw materials, and the method ...

Method for producing trioctyl trimellitate with trimellitic acid

The invention relates to a method for producing trioctyl trimellitate through using trimellitic acid. Intermediate products of trimellitic acid and methanol in the process of producing the trimellitic anhydride are esterified to generate trimethyl trimellitate; the trimethyl trimellitate and 2-ethylhexanol (commonly called asoctanol) are subjected to ester exchange to produce trimellitate (2-ethyl) trihexyl ester (trioctyl trimellitate). The method of methyl esterification and ester exchange can reduce requirement on a technology and equipment so that the intermediate product of the trimellitic acid in the process of producing the trimellitic anhydride is flexibly utilized.

Method for concentrating at low temperature and pretreating concentrated solution

The invention relates to a method for concentrating at low temperature and pretreating concentrated solution. The method mainly comprises the following steps: 1, preparing mass percentage of formaldehyde solution for reacting to be between 3 and 15 percent; 2, adding frozen diluted formaldehyde solution into a concentration autoclave; 3, adding n-butyl aldehyde and alkali metal hydroxide solution into the autoclave by two parts for two times; 4, dripping methanoic acid into concentrated solution; 5, pumping the acidified concentrated solution into a formaldehyde stripping tower to remove formaldehyde, methanol and partial water; and 6, pumping distillate into a dealcoholizing tower if the mass percentage of the methanol in the distillate obtained in the step five exceeds 2 percent, and distilling the methanol thereinto under normal pressure condition. The concentrated solution obtained through low temperature concentration, step feed and pressurized formaldehyde stripping/dealcoholizing ...

Method for producing sodium formate

The invention relates to a method for producing sodium formate, and comprises the following technique processes: 1. taking n-butanal, formaldehyde solution and caustic soda liquid as raw materials, carrying out low temperature condensation to obtain a condensation solution, and acidating with formic acid followed by pre-treatment; 2. concentrating the condensation solution; 3. extracting the condensation solution in an extracting tower with an alcohol organic solvent containing 5-9 carbon atoms, leading the organic phase after extracting into the bottom part of a bath tower, amplifying the inner diameter dimension of the top part of the bath tower accounting for 5-30% of the height range of the bath tower by 10-50%, carrying out countercurrent washing on the organic phase by using de-ionized water or aqueous solution saturated by trimethylolpropane, the aqueous phase after washing into the upper part of the extracting tower to countercurrent contact with an extract and an oil phase entering ...

Method for producing sodium acetate trihydrate and anhydrous sodium acetate as byproducts

The invention relates to a method for producing sodium acetate trihydrate and anhydrous sodium acetate as byproducts, which comprises the following steps: firstly, taking sodium acetate solution which is a byproduct generated in the production process of trimellitic anhydride, pouring into a material mixing kettle, stirring, and neutralizing until the pH value is 6-9; secondly, evaporating and concentrating; thirdly, putting the concentrated sodium acetate solution in a crystallization kettle, cooling to 60-57 DEG C, adding sodium acetate trihydrate crystals accounting for 0.05-0.5% by mass of the solution in the kettle to provoke the crystallization, and stirring for more than 12 hours; fourthly, centrifugally separating to obtain the solid phase which is the sodium acetate trihydrate; and fifthly, drying the sodium acetate trihydrate in a vortex drier to obtain the anhydrous sodium acetate. The method can prevent the sodium acetate solution from being supercooled, avoids the processes ...

Method for producing propylene glycol methyl ether acetate

The invention relates to a method for producing propylene glycol methyl ether acetate. The method is characterized in that a reactive kettle made of an acid-resisting material is applied to a reactive fractionating tower and the front passage of a material kettle on the lower part of the reactive fractionating tower; under the existence of a catalyst, when the number of moles of propylene glycol methyl ether is excessive compared with that of the acetic acid, the esterification is carried out concentratively in the reactive kettle; the obtained product and the unreacted material are evaporated and pass an acid catcher so that the acidic catalyst with a high boiling point is collected in liquid phase; the material of gas phase enters the reactive fractionating tower through a material inlet; an entrainer is added at the upper part of the reactive fractionating towel so as to remove the water in the material by azeotropy; under the action of the layered solid acid catalyst, the residual acetic ...

Method for recycling ditrimethylolpropane

The invention relates to a method for recycling ditrimethylolpropane, which is characterized by comprising the steps of: transferring heavy constituents at the bottom of a rectifying kettle in a refining procedure of trimethylolpropane, then filtering when hot in necessity, removing impurities with high crystallization point, transferring to a dynamic melt crystallizer, carrying out separation of crystallization, sweating and melting at a programmed temperature to ensure that other main impurities of the ditrimethylolpropane and the heavy constituents are separated; and carrying out refining of crystallization, sweating and melting on the collected rough ditrimethylolpropane at a programmed temperature to obtain a ditrimethylolpropane product with content of higher than 95 percent, which accords with the general requirements of industrial products. If higher requirements on platinum-cobalt chroma of not more than 15APHA are required in the color number of the products, the color is removed ...

Continuous production process of high purity trimellitic anhydride with trimellitic acid