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The preparation method of alpha-methyl styrene

A kind of technology of methyl styrene and propyl benzene flow, applied in the field of preparation of α-methyl styrene, can solve problems such as shortage, increase of AMS production volume, etc., and achieve the effect of improving selectivity and

Active Publication Date: 2016-02-10
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, existing methods only attempt to minimize the production of AMS (US Patent No. 5,530,166), and studies to increase the production of AMS are still lacking.

Method used

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  • The preparation method of alpha-methyl styrene
  • The preparation method of alpha-methyl styrene
  • The preparation method of alpha-methyl styrene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and 2

[0075] according to figure 2 The process diagram shown, prepares α-methylstyrene.

[0076] First, the phenol process utilizes three oxidation reactors, and the oxidation of cumene with an oxidizing agent is carried out by the following conditions to produce a stream containing cumene hydroperoxide (CHP) at a concentration of 25% by weight.

[0077] (1) Conditions for putting in the first oxidizer (firstoxidizer)

[0078] Supply (CHP0.4%+cumene 99.6%) 1ml / min, 02:100ml / min, pressure: 3bar, reaction temperature: 100°C.

[0079] (2) Conditions for putting in the second oxidizer (secondoxidizer)

[0080] Supply (CHP8.42%+cumene 91.58%) 1ml / min, 02:100ml / min, pressure: 3bar, reaction temperature: 96°C.

[0081] (3) Conditions for putting in the third oxidizer (thirdoxidizer)

[0082] Supply (CHP16.27%+cumene 83.73%) 1ml / min, 02:100ml / min, pressure: 3bar, reaction temperature: 94°C.

[0083] At this time, as shown in Table 1 below, the concentration of the CHP stream was chang...

experiment example

[0106] In said Example 1, after the addition of CHP during the hydrogenation process, the composition of the reactant solution was analyzed over time. According to its composition analysis, the CHP conversion rate and CA increase rate in the catalytic hydrogenation process were measured by the following method, and the results are shown in Table 3.

[0107] [mathematical formula 1]

[0108] CHP conversion rate (%) = (CHP supply (weight %) - CHP product (weight %)) / (CHP supply (weight %))

[0109] [mathematical formula 2]

[0110] CA increase rate (%) = (CA product (weight %) - CA supply (weight %)) / (CA supply (weight %))

[0111] [table 3]

[0112]

[0113]

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Abstract

This disclosure relates to a method of preparing alpha methyl styrene that may lower explosion risk during a hydrogenation reaction of cumene hydroperxoide due to increase in concentration, improve selectivity to 90% or more to increase the amount to cumyl alcohol thus selectively increasing the amount of alpha methyl styrene, and control the amount of cumene hydroperoxide to control the production amount of alpha methyl styrene according to market demand, through a selective hydrogenation process of cumene hydroperoxide obtained by oxidation of cumene during a phenol preparation process under maximally stabilized conditions of low concentration and temperature.

Description

technical field [0001] The invention relates to a preparation method of α-methylstyrene used for selectively increasing production of α-methylstyrene. Background technique [0002] α-methylstyrene (alpha-methylstyrene, hereinafter referred to as AMS) is used in various ways as an additive in the preparation of specific copolymers such as ABS and new polymers. Moreover, the use of AMS is also used as an intermediate in the preparation of micro-compounds such as unsaturated ABS dimers. These dimers are used as molecular weight control agents in the preparation of acrylonitrile-butadiene-styrene copolymer resins and copolymers such as styrene-butadiene rubber. The hydrogenated form of the AMS dimer has commercial value as an ingredient in lubricating compositions. [0003] This AMS is a by-product of the phenol preparation process, and cumene is generally used as a raw material to prepare phenol and AMS through oxidation and dehydration processes. figure 1 It is a process sc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C5/333C07C15/46B01J23/38
CPCC07C1/24B01J21/18B01J23/44C07C29/15C07C2521/06C07C2521/18C07C2523/10C07C2523/24C07C2523/44C07C2527/054C07C2527/11C07C2527/25Y02P20/52
Inventor 河丞柏俞锡俊曹东铉
Owner LG CHEM LTD