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Production of pivalic acid

A pivalic acid and pressure technology, which is applied in the field of producing pivalic acid by synthetic methods, can solve the problems of affecting market competitiveness, high cost, and high cost of pivalic acid, so as to reduce energy consumption, concentration, and production cost effect

Inactive Publication Date: 2006-05-31
周强 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect of this new technology described in this patented text involves replacing expensive chemical solvents like acetone or dimethyltin chloroform (DMF) for producing pentaerythritoltanesulfonic acid instead of making it from mixed materials containing only two components - mimolecular olefins made up mainly of propylene molecules and unsaturates attached through double bonds called cis-1,cis-2,5-(CH2)nC(O)-S). This results in less waste compared to traditional methods such as sulfuricsor formal chemistry processes due to fewer steps involved. Additionally, there are no harmful substances released during these reactions which can be problematic when produced on an industrial scale.

Problems solved by technology

The technical problem addressed in this patents relates to improving methods for producing specific types of compounds called pentaerythritis acids ("PGA"), specifically those commonly found naturally occurring within various plants including citrus fruits like lime tree, pea trees, grape seeds, sorghum berries, cranberbons, carboys, straw oil residue, turmeriextrins, dimers, cyclohexane, ammonia, formalidone, oxazolidones, dicyclomatic esters, diphenolsulfonimides, hexamethanesulphonic Acid, heptadecanedicapiranoe Sulfoxi AceticAcid Amount Percentage (%) calculated based on its mass per volume basis. However, these processes involve expensive starting materials and complicated steps making them difficult to commercialize due to their low yields.

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

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Claims

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Application Information

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Owner 周强
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