Unlock instant, AI-driven research and patent intelligence for your innovation.

Continuous production process for directly synthesizing adipate by oxidizing cyclohexene with hydrogen peroxide

A technology of cyclohexene oxidation and production process, which is applied in the direction of oxidative preparation of carboxylic acid, organic chemistry, etc., can solve the problems of poor continuity, complicated operation, high risk, etc., and achieve the effects of convenient processing, improved economic benefits, and reduced labor intensity

Inactive Publication Date: 2013-10-23
SHANXI YANGMEI FENGXI FERTILIZER IND GRPCO
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a continuous process for directly synthesizing adipic acid by oxidizing cyclohexene with hydrogen peroxide in order to solve the problems of complicated operation, high risk and poor continuity in the process of producing adipic acid by using cyclohexene and hydrogen peroxide intermittent method. Production Process

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Continuous production process for directly synthesizing adipate by oxidizing cyclohexene with hydrogen peroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1, a kind of continuous production process of directly synthesizing adipic acid with hydrogen peroxide oxidation cyclohexene, comprises the following steps:

[0027] 1, raw material, the cyclohexene in the cyclohexene tank 1, the hydrogen peroxide in the hydrogen peroxide tank 2, the catalyst (sodium tungstate, in tungsten) in the catalyst tank 3, then according to the molar ratio 1: 3.5: 0.5 The flow number, according to the total flow of 300 liters / hour, is continuously pumped in the reflux kettle 6 simultaneously, and in the reflux kettle 6, cyclohexene, hydrogen peroxide, and catalyst react (equation C 6 h 10 +4H 2 o 2 =C 6 h 10 o 4 +4H 2 (0), temperature of reaction is controlled at 60 DEG C, pressure 0.5mpa, material residence time 8 hours, then continuously transfers to next first-level still reaction 8, (also can use following catalyzer: three glycine phosphotungstic (molybdenum) salt catalyst or cetylpyridinium ammonium phosphotungstic acid or...

Embodiment 2

[0032] Embodiment 2, a kind of continuous production process of directly synthesizing adipic acid with hydrogen peroxide oxidation cyclohexene, comprises the following steps:

[0033] 1, raw material, the cyclohexene in the cyclohexene tank 1, the hydrogen peroxide in the hydrogen peroxide tank 2, the catalyst (tungsten trioxide, in tungsten) in the catalyst tank 3, then according to the molar ratio 1: 4: 0.3 The number of flows, while continuously pumping into the reflux kettle, cyclohexene, hydrogen peroxide, and catalyst react in the reflux kettle (equation C 6 h 10 +4H 2 o 2 =C 6 h 10 o 4 +4H 2(0), temperature of reaction is controlled at 75 DEG C, pressure 0.3mpa, material residence time 7 hours, then continuously changes over to next kettle reaction,

[0034] 2. The reaction liquid in the reflux kettle continuously enters the next reaction kettle to further convert cyclohexene, reacts at a temperature of 80°C, a pressure of 0.3mpa, and a material residence time of...

Embodiment 3

[0038] Embodiment 3, a kind of continuous production process of directly synthesizing adipic acid with hydrogen peroxide oxidation cyclohexene, comprises the following steps:

[0039] 1, raw material, the cyclohexene in the storage tank, the hydrogen peroxide in the storage tank, the catalyst (triglycine phosphotungstic (molybdenum) salt catalyst) in the storage tank, then according to the molar ratio 1: 5: 0.1 (with tungsten meter), while continuously pumping into the reflux kettle, cyclohexene, hydrogen peroxide and catalyst react in the reflux kettle (equation C 6 h 10 +4H 2 o 2 =C 6 h 10 o 4 +4H 2 (0), temperature of reaction is controlled at 80 DEG C, pressure 0.1mpa, material residence time 5 hours, then continuously changes over to next kettle reaction,

[0040] 2. The reaction liquid in the reflux kettle continuously enters the next reaction kettle to further convert cyclohexene, reacts at a temperature of 95°C, a pressure of 0.01mpa, and a material residence ti...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a new process for producing adipate, in particular to a new process for producing adipate by oxidizing cyclohexene with hydrogen peroxide, solving the problems of large fluctuation of technical index, complicated operations, more devices and poor adaptability during intermittent production. The new process adopts the following main steps of: continuously feeding, evenly adding at a certain proportion from a raw material metering groove through a liquid level meter and a metering pump, feeding a reflow kettle and reflowing and carrying constant temperature reaction after reflowing; and pumping away most of water in the system by a vacuum concentrating pump under vacuum action after the reaction is ended and then crystallizing and centrifuging to obtain an adipate product. The used devices omits a reflowing device, an external circulating pump and the like; the flowing of materials is fully utilized, so that various phases for reaction are carried out in different reaction kettles, the temperatures of various kettles are smooth, the operation is convenient, the production efficiency is improved, the equipment investment is saved and the industrial production is quite convenient.

Description

technical field [0001] The invention relates to a new process for producing adipic acid, in particular to a continuous production process for directly synthesizing adipic acid by oxidizing cyclohexene with hydrogen peroxide. Background technique [0002] At present, the main industrial production process routes of adipic acid can be divided into cyclohexane method, cyclohexene method and so on. These routing characteristics are: [0003] 1. Cyclohexane method: benzene is used as raw material, and cyclohexane is prepared by catalytic hydrogenation. Cyclohexane is oxidized by air to produce cyclohexanone and cyclohexanol (KA oil), and then oxidized by nitric acid to synthesize adipic acid. The process has a long history of application and is mature, but the process is complicated, the conversion rate is low, there are many by-products, and the equipment investment is huge and the production cost is high. Especially the emitted N 2 O and other waste gas, waste water and soli...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C07C55/14C07C51/31
Inventor 韩喜民解交平原中秋杨民康李楷王会串
Owner SHANXI YANGMEI FENGXI FERTILIZER IND GRPCO