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Production of pivalic acid

A technology of pivalic acid and pressure is applied in the field of preparing pivalic acid by a synthetic method, which can solve the problems of high cost, high cost of pivalic acid, influence on market competitiveness, etc. The effect of production costs

Inactive Publication Date: 2008-01-23
周强 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But, this method is owing to use pure isobutene as raw material in actual production, and pure isobutene is made by sulfuric acid absorption-decomposition method or methyl tert-butyl ether cracking method again, and cost is high, makes the pivalic acid cost of production higher , thereby affecting the market competitiveness of such products

Method used

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  • Production of pivalic acid
  • Production of pivalic acid
  • Production of pivalic acid

Examples

Experimental program
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Effect test

example 1

[0031] With 1.65 tons of butadiene-free carbon four cuts (isobutene 45%, isobutane 3%, 1-butene 25%, n-butane 11%, trans-2-butene 9%, cis-2-butene 7 % and 1,3-butadiene <0.5%) and 2.7 tons of 50% sulfuric acid as raw materials, the reaction temperature is 15-40 ° C and the pressure is 0.12-0.45Mpa, respectively enter the sulfuric acid absorption tower for esterification. The reaction mixture (tert-butyl sulfate, tert-butanol and raffinate containing isobutylene) enters the separator for separation, and the lower layer mixture (tert-butyl sulfate, tert-butanol) enters the flash column for flashing to remove A small amount of hydrocarbons, the mixture obtained (the total content of tert-butyl sulfate and tert-butanol is more than 99% after analysis), enters the mixer and mixes with chloroform from the solvent storage tank, and the mixed solution enters the carbonylation reactor , add 4.3 tons of 85% sulfuric acid in the carbonylation reactor simultaneously, carry out carbonylati...

example 2

[0033] With 1.65 tons of butadiene-free carbon four cuts (isobutene 45%, isobutane 3%, 1-butene 25%, n-butane 11%, trans-2-butene 9%, cis-2-butene 7 % and 1,3-butadiene <0.5%) and 3.0 tons of 50% sulfuric acid as raw materials, the reaction temperature is 15-40°C and the pressure is 0.12-0.45Mpa, respectively enter the sulfuric acid absorption tower for esterification. The reaction mixture (tert-butyl sulfate, tert-butanol and raffinate containing isobutylene) enters the separator for separation, and the lower layer mixture (tert-butyl sulfate, tert-butanol) enters the flash column for flashing to remove A trace amount of hydrocarbons, the mixture obtained (the total content of tert-butyl sulfate and tert-butanol reaches more than 99% after analysis) enters the mixer and mixes with the chloroform from the solvent storage tank, and the mixed solution enters the carbonylation reactor, Add 4.3 tons of 85% sulfuric acid in the carbonylation reactor simultaneously, carry out carbon...

example 3

[0035]With 1.65 tons of butadiene-free carbon four cuts (isobutene 45%, isobutane 3%, 1-butene 25%, n-butane 11%, trans-2-butene 9%, cis-2-butene 7 % and 1,3-butadiene <0.5%) and 2.7 tons of 50% sulfuric acid as raw materials, the reaction temperature is 10-15°C and the pressure is 0.1-0.12Mpa, respectively enter the sulfuric acid absorption tower for esterification. The reaction mixture (tert-butyl sulfate, tert-butanol and raffinate containing isobutylene) enters the separator for separation, and the lower layer mixture (tert-butyl sulfate, tert-butanol) enters the flash column for flashing to remove A trace amount of hydrocarbons, the mixture obtained (the total content of tert-butyl sulfate and tert-butanol reaches more than 99% after analysis) enters the mixer and mixes with the chloroform from the solvent storage tank, and the mixed solution enters the carbonylation reactor, Add 4.3 tons of 85% sulfuric acid in the carbonylation reactor simultaneously, carry out carbonyl...

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Abstract

Production of tepentanoic acid is carried out by C4 cut fraction not containing butadiene, sulfuric acid and carbonic oxide as raw materials, mixing C4 cut fraction not containing butadiene with sulfuric acid, esterification reacting at special temperature and pressure, separating out abstracted liquor containing minor isobutene of upper layer, carbonylation reacting lower layer with carbon monoxide, hydrolyzing and separating to obtain final product. It is simple, costs low and has less consumption.

Description

technical field [0001] The invention belongs to a production method of chemical products, in particular to a method for preparing pivalic acid through a synthetic method. Background technique [0002] Pivalic acid, also known as trimethylacetic acid or 2,2-dimethylpropionic acid, English name: pivalic acid (referred to as PA), CA registration number: 75-98-9, molecular formula: C 5 h 10 o 2 , the structural formula is: [0003] [0004] The molecular weight is 102.13, it is a white solid at room temperature, with a special odor, the melting point is 35.5°C, the boiling point is 163-164°C, and the density is 0.905g / cm 3 , with a flash point of 63°C, slightly soluble in water, easily soluble in alcohol and ether, and has certain corrosiveness. It should be stored in a cool place away from light and filled with nitrogen or vacuum-sealed to prevent the product from darkening. As an important chemical raw material and chemical reagent, it is mainly used in the synthesis o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C53/126C07C51/10
Inventor 周强戴广林
Owner 周强
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