A method for improving the decomposition yield of cumene hydroperoxide

A technology of cumene hydroperoxide and decomposer, which is applied in chemical instruments and methods, preparation of oxygen-containing compounds, preparation of organic compounds, etc., can solve the problem of high acetone content, increase of decomposed liquid discharge flash system, isopropyl Solve the problems of high benzene consumption, achieve the effect of low acetone content, reduce energy consumption, and improve production capacity

Active Publication Date: 2017-09-19
张殿豪
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Aiming at the problems existing in the decomposition unit of the existing phenol-acetone plant, the present invention will solve the problems of high consumption of raw material cumene in the decomposition unit and high content of acetone in the decomposition liquid in the existing phenol-acetone plant by improving the process flow and operating conditions of the decomposition system , including increasing the circulating cooler of the decomposer, determining new decomposition operating conditions, increasing the decomposition liquid discharge flash system, etc.

Method used

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  • A method for improving the decomposition yield of cumene hydroperoxide
  • A method for improving the decomposition yield of cumene hydroperoxide
  • A method for improving the decomposition yield of cumene hydroperoxide

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Embodiment 1

[0076] The concentrated cumene hydroperoxide solution from the oxidation unit of the phenol-acetone plant contains 81.92% cumene hydroperoxide, 14.33% cumene, 3.36% dimethyl benzyl alcohol, and 0.39% acetophenone. Send to the decomposition unit R-1 of the decomposition unit; the condensed water of the vacuum system recovered by the rectification unit is pumped into the decomposer by the rectification unit as the process adjustment water. The composition of the process adjustment water is 98.71% water content, 1.06% acetone, 0.23 %; Concentration is that the concentrated sulfuric acid of 98% divides two strands ((being specifically sulfuric acid II13 and sulfuric acid I12)) and is sent in the cracker circulation pipe by cracker discharge pump pump P-1; Cumene hydroperoxide is under the sulfuric acid catalyst Decomposition exothermic reaction occurs, the temperature of the decomposer is 62°C, the pressure is 426mmhg, the concentration of sulfuric acid is 100ppm, and the content o...

Embodiment 2

[0082] In embodiment 1, for the device of production capacity 200,000 tons of phenol acetone / year, the ratio of the sulfuric acid of two strands is 10:1 (being specifically sulfuric acid II13 and sulfuric acid I12), and recirculating cooler outlet temperature is 52 ℃, enters calorimetry The flow rate of the device) is 1.6m 3 / h, the amount of sulfuric acid added to the calorimeter is 1kg / h, the internal circulation distributor of the decomposer adopts a row-pipe type, the diameter of the injection hole is 6mm, and the number of holes is 6.

[0083] Save cumene raw material 2529 tons / year, sulfuric acid (concentration 98%) raw material 91 tons / year, caustic soda (concentration 32%) raw material 229 tons / year, circulating water 656110 tons / year, steam 3568 tons / year.

Embodiment 3

[0085] In embodiment 1, for the device of 350,000 tons of phenol acetone / year of production capacity, the ratio of the sulfuric acid of two strands is 16: 1 ((being specifically sulfuric acid II13 and sulfuric acid I12)), and circulating cooler outlet temperature is 56 ℃, amount Heater flow rate is 2.6m 3 / h, the amount of sulfuric acid added to the calorimeter is 1.7kg / h, the internal circulation distributor of the decomposer adopts the calandria type, the diameter of the injection hole is 7mm, and the number of holes is 8.

[0086] Save cumene raw material 4492 tons / year, sulfuric acid (concentration 98%) raw material 158 tons / year, caustic soda (concentration 32%) raw material 406 tons / year, circulating water 1173170 tons / year, steam 6331 tons / year.

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Abstract

The invention relates to a method for improving the decomposition yield of cumene hydroperoxide in a phenol-acetone plant. Different points are added to the decomposition liquid circulation system; (3) reduce the concentration of sulfuric acid in the decomposer; (4) increase the residence time of the decomposition liquid in the decomposer and reduce the reaction temperature of the decomposer; (5) increase the concentration of the decomposition liquid in the secondary decomposer (6) increase the secondary decomposition reaction temperature; (7) flash the secondary decomposition output to recover energy and circulate all or part of the flash condensate back to the decomposer, and the remainder is sent to the downstream of the phenol acetone plant Crude acetone tower; (8) Partially decomposer steam condensate is sent to the fine acetone tower or feed feed tank downstream of the phenol acetone plant. The invention mainly solves the problems of lower decomposition yield, more tar by-products, higher salt content in rectification feed and the like in the existing phenol-acetone production technology.

Description

technical field [0001] The invention relates to the technical field of phenol-acetone production, in particular to a method for improving the decomposition yield of cumene hydroperoxide. Background technique [0002] Both phenol and acetone are organic chemicals with a wide range of uses. The usual production method is to use cumene as a raw material to generate cumene hydroperoxide through the air oxidation of cumene, and the concentrated cumene hydroperoxide (concentration usually contains cumene hydroperoxide 82 %) is decomposed under the catalysis of concentrated sulfuric acid catalyst and after a series of purification, two products of phenol and acetone are obtained simultaneously. The decomposition of cumene hydroperoxide also uses solid acid as a catalyst. The decomposition of cumene hydroperoxide is a strong exothermic reaction, and the decomposition process will produce many by-products, which will affect the yield of decomposition, that is, the consumption of ra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C27/00C07C37/08C07C37/74C07C39/04C07C45/53C07C45/82C07C49/08
CPCY02P20/52
Inventor 张殿豪
Owner 张殿豪
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