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Method of raising decomposition yield of cumyl hydroperoxide

A technology of cumene hydrogen peroxide and decomposer, which is applied in chemical instruments and methods, preparation of oxygen-containing compounds, preparation of organic compounds, etc. The problem of high consumption of benzene, to achieve the effect of reducing energy consumption, low acetone content, and improving production capacity

Active Publication Date: 2016-06-15
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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  • Method of raising decomposition yield of cumyl hydroperoxide
  • Method of raising decomposition yield of cumyl hydroperoxide
  • Method of raising decomposition yield of cumyl hydroperoxide

Examples

Experimental program
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Effect test

Embodiment 1

[0076] The concentrated cumene hydroperoxide solution from the oxidation unit of the phenol acetone unit contains 81.92% of cumene hydrogen peroxide, 14.33% of cumene, 3.36% of dimethyl benzyl alcohol, and 0.39% of acetophenone. The pump of the oxidation unit The decomposer R-1 is sent to the decomposition unit; the vacuum system condensate recovered by the rectification unit is pumped into the decomposer by the rectification unit as process adjustment water. The composition of the process adjustment water is 98.71% water, 1.06% acetone, and 0.23 phenol %; Concentrated sulfuric acid with a concentration of 98% is divided into two strands (specifically, sulfuric acid II13 and sulfuric acid I12), which are sent into the decomposer circulation pipe by the discharging pump P-1 of the decomposer; cumene hydrogen peroxide is under the sulfuric acid catalyst The decomposition heat reaction occurs. The temperature of the decomposer is 62℃, the pressure is 426mmhg, the concentration of s...

Embodiment 2

[0082] In Example 1, for a device with a production capacity of 200,000 tons of phenol and acetone per year, the ratio of two shares of sulfuric acid is 10:1 (specifically, sulfuric acid II13 and sulfuric acid I12), and the outlet temperature of the circulating cooler is 52°C. The flow rate of the device) is 1.6m 3 / h, the amount of sulfuric acid added in the calorimeter is 1kg / h, the circulating distributor in the decomposer adopts the tube type, the diameter of the injection hole is 6mm, and the number of holes is 6.

[0083] It saves 2,529 tons of cumene raw materials per year, 91 tons of sulfuric acid (98% concentration) raw materials per year, 229 tons of caustic soda (32% concentration) raw materials, 656,110 tons of circulating water per year, and 3,568 tons of steam per year.

Embodiment 3

[0085] In Example 1, for a device with a production capacity of 350,000 tons of phenol and acetone per year, the ratio of the two shares of sulfuric acid is 16:1 ((specifically sulfuric acid II13 and sulfuric acid I12)), and the outlet temperature of the circulating cooler is 56°C. Heater flow rate is 2.6m 3 / h, the amount of sulfuric acid added in the calorimeter is 1.7kg / h, the circulating distributor in the resolver adopts a pipe type, the diameter of the injection hole is 7mm, and the number of holes is 8.

[0086] It saves 4492 tons / year of cumene raw materials, 158 tons / year of sulfuric acid (98% concentration) raw materials, 406 tons / year of caustic soda (32% concentration) raw materials, 1,173170 tons / year of circulating water, and 6,331 tons / year of steam.

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Abstract

The invention relates to a method for raising the decomposition yield of cumyl hydroperoxide of a phenol-acetone unit.The method includes the steps that 1, first-level decomposition liquid is recycled to a decomposer through a special distributor after being cooled; 2, a concentrated sulfuric acid catalyst is added into a decomposition liquid recycling system from two different points; 3, the concentration of sulfuric acid in the decomposer is lowered; 4, standing time of decomposition liquid in the decomposer is increased, and the reaction temperature of the decomposer is lowered; 5, standing time of the decomposition liquid in a second-level composer is increased; 6, the reaction temperature of second-level decomposition is increased; 7, flash evaporation is conducted on materials discharged through second-level decomposition to recycle energy, total or part of flash evaporation condensate liquid is recycled to the decomposer, and the remaining part is sent to a crude acetone tower on the downstream of the phenol-acetone unit; 8, part of decomposer steam condensate liquid is sent to a fine acetone tower on the downstream of the phenol-acetone unit or fed into a feeding tank.The method mainly solves the problems that by means of an existing phenol acetone production technology, the decomposition yield is low, a great number of tar by-products are generated, and a distilled fed material is high in salt content.

Description

Technical field [0001] The invention relates to the technical field of the production of phenol and acetone, in particular to a method for improving the decomposition yield of cumene hydrogen peroxide. Background technique [0002] Both phenol and acetone are organic chemical products with a wide range of uses. The usual production method is to use cumene as a raw material to generate cumene hydroperoxide through air oxidation of cumene. The concentrated cumene hydroperoxide (the usual concentration is cumene hydroperoxide containing 82 %) is decomposed under the catalysis of concentrated sulfuric acid catalyst and undergoes a series of purifications to simultaneously obtain two products of phenol and acetone. The decomposition of cumene hydroperoxide also uses solid acid as a catalyst. The decomposition of cumene hydroperoxide is a strong exothermic reaction, and many kinds of by-products will be produced during the decomposition process. These by-products will affect the yiel...

Claims

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Application Information

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IPC IPC(8): C07C27/00C07C37/08C07C37/74C07C39/04C07C45/53C07C45/82C07C49/08
CPCY02P20/52C07C37/08C07C37/74C07C45/53C07C45/82
Inventor 张殿豪
Owner 张殿豪
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