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Method of high yield cyclohexyl hydroperoxide decomposition

A technology of cyclohexyl hydrogen peroxide and decomposition, which is applied in the directions of organic chemistry methods, chemical instruments and methods, carbon-based compound preparation, etc., can solve the problem of high fixed cost of production equipment during downtime

Inactive Publication Date: 2005-08-24
INVISTA TECHNOLOG IES S A R L
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High fixed costs for production equipment due to long downtimes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In Example 1, 1,360t / h of air oxidant tails containing 0.71% cyclohexanol, 1.12% cyclohexanone and 3.24% cyclohexyl hydroperoxide were mixed with 1.0t / h in a static mixer at a temperature of 120 degrees Celsius. h recycle water to mix. The ratio of aqueous phase to organic phase was 0.28:100. The separated water was decanted using a decanter. The organic phase was treated with a caustic cobalt solution containing 5 ppm Co at 118 °C, and CHHP was decomposed in a CHHP decomposition reactor. The caustic solution is separated using a decanter and the organic phase is washed with water. The concentration of cyclohexanol in the organic phase after water washing is 1.71wt%, and the concentration of cyclohexanone is 2.47wt%, which is equivalent to a yield of 91.30% in the decomposition process of CHHP.

Embodiment 2

[0044] In this experiment, the amount of recycled water was increased to 1.5 t / h, the ratio of water phase to organic phase was 0.43:100, and other parameters remained the same as in Example 1. The yield of the CHHP decomposition process in this case was 90.56.

Embodiment 3

[0046] Example 3 was carried out in a similar manner to Example 1, except that the cobalt catalyst concentration was increased to 10 ppm. The measured yield of the CHHP decomposition process was 96.9%. Example 3 shows that under the condition of low recirculation water flow rate (1.0t / h), the catalyst concentration is increased, and the yield is improved.

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PUM

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Abstract

Disclosed is a process for cyclohexyl hydroperoxide (CHHP) decomposition using in aqueous alkaline solution in presence of cobalt catalyst.

Description

field of invention [0001] The present invention relates to a method for preparing cyclohexanol and / or cyclohexanone by oxidizing cyclohexane with air and then decomposing cyclohexyl hydroperoxide in an alkaline aqueous solution in the presence of a cobalt catalyst. Background of the invention [0002] Adipic acid reacts with 1,6-hexanediamine to form the hexamethylene adipate salt, where the salt polymerizes to produce nylon 6,6. One method of producing adipic acid is the oxidation of cyclohexane with air. Cyclohexane oxidation in this manner produces a mixture containing cyclohexanone (K), cyclohexanol (A) (commonly referred to together as "KA") and cyclohexyl hydroperoxide (CHHP). These methods are described in US Patent 3,957,876. Cyclohexyl hydroperoxide can be decomposed to give a mixture of cyclohexanone and cyclohexanol. [0003] Various methods of decomposing cyclohexyl hydroperoxide have been described in the art. Kragten and Baur in E.P. No. 0659726B1 describe ...

Claims

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Application Information

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IPC IPC(8): C07C27/00C07B61/00C07C29/10C07C29/132C07C35/08C07C45/53C07C49/403
CPCC07C45/53C07C29/132C07C2101/14C07C2601/14C07C31/1355C07C49/403C07C29/10
Inventor L·福多尔
Owner INVISTA TECHNOLOG IES S A R L
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