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

Production method and production device of chloride-free phenylcarbinol

A production method, the technology of chlorobenzyl alcohol, which is applied in the field of the production method of chlorinated benzyl alcohol and its production equipment, can solve the problems that benzyl alcohol cannot be used as food, medicine and cosmetics, the production process of benzyl alcohol is complicated, and the yield of benzyl alcohol is low, etc. Achieve the effects of suppressing the formation of by-products, stable transmission, and high purity

Active Publication Date: 2017-02-15
宁波杰尔盛化工有限公司
View PDF4 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The benzyl alcohol produced by this method also has the following problems except that the production process is complicated: the generation of by-product dibenzyl ether is arranged during hydrolysis; the benzyl alcohol yield produced by this method is low, at about 70-72%; The inevitable presence of free chloride ions and ppm-level organic chlorides affects its application in medicine, food and other fields
[0004] The Chinese patent with the publication number CN102757312A discloses a method for preparing benzyl alcohol with high selectivity and low energy consumption. Put it into the primary reactor according to the mass ratio of 8:1-2:1, stir and heat, and react at 90-115°C and normal pressure for 0.5-3 hours; C. Transfer the above reaction liquid to the secondary reactor, Stir and heat, and react for 0.5-3 hours at 130-180°C and 0.4-0.8Mpa under pressure; D. Cool and settle the reaction solution to separate the oil phase, and the oil phase is subjected to rough distillation and rectification to obtain the product. However, the benzyl alcohol prepared by the above method cannot avoid the introduction of halogens, and cannot be used as an occasion requiring high-quality materials such as food, medicine and cosmetics

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
  • Production method and production device of chloride-free phenylcarbinol

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] 1) Preparation of benzoate

[0029] , n=1~10

[0030] 2) Preparation of benzyl alcohol by hydrogenation of benzoic acid ester

[0031] , n=1~10.

[0032] The production equipment among the present invention comprises batching kettle 1, batching tank 2, 5 continuous reactors 3, flash tower 4, grease trap 5 and ester collection tank 6, and material is mixed into from batching tank 2 according to proportioning ratio. In the molten state, the molten material enters the batching tank 2, and then is transported to the continuous reactor 3 for esterification reaction. The nitrogen in the continuous reactor 3 is passed to the flash tower 4, and the gas phase of the flash tower 4 leads to the ester collection tank 6, and the flash tower 4 The liquid phase leads to the oil separation tank 5, and the oil separation tank 5 leads to the ester collection tank 6, and the ester collection tank 6 returns the collected materials back to the batching tank 2 on a regular basis.

[0...

Embodiment 1

[0036] A kind of production method of benzyl alcohol comprises methyl benzoate production stage and benzyl alcohol production stage, and concrete steps are as follows:

[0037] 1) Methyl benzoate production stage:

[0038] Benzoic acid: methyl alcohol is 1:40 mol ratio and is stored in batching tank after mixing, and wherein benzoic acid is 100000mol, through batching tank material passes through five diameters continuously and is 1m, high 5m esterification reactor; The temperature is kept at 100°C, the pressure is kept at 0.5MPa, and the reaction residence time is 10h; the water and a small amount of methyl benzoate generated by the reaction are taken away by nitrogen; the water and organic matter blown out by nitrogen are separated by a flash tower, The distilled organic matter is returned to the esterification reaction system, and the distilled water is treated with sewage; the methyl benzoate generated by the reaction flows out from the bottom of the fifth esterification r...

Embodiment 2

[0042] A kind of production method of benzyl alcohol comprises ethyl benzoate production stage and benzyl alcohol production stage, and concrete steps are as follows:

[0043] 1) Ethyl benzoate production stage:

[0044]Benzoic acid: ethanol is stored in the batching tank after mixing the mol ratio of 1:1, wherein benzoic acid is 100000mol, through the batching tank material continuously passes through five esterification reactors with a diameter of 1m and a height of 5m; The temperature is kept at 140°C, the pressure is kept at 1MPa, and the reaction residence time is 22h; the water and a small amount of ethyl benzoate generated by the reaction are taken away by nitrogen; The organic matter is returned to the esterification reaction system, the distilled water is discharged after sewage treatment, and the ethyl benzoate produced by the reaction flows out from the bottom of the fifth esterification reaction kettle.

[0045] 2) Benzyl alcohol production stage:

[0046] γ-Al ...

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 production method of chloride-free phenylcarbinol. The production method comprises following steps: 1, benzoic acid is mixed with an aliphatic straight-chain saturated monohydric alcohol, and an obtained mixture is subjected to continuous reaction for 10 to 40h at 0.1 to 1.0MPa so as to obtain benzoic ether; 2, benzoic ether is reacted with hydrogen under catalyst action of Cu-Zn so as to obtain phenylcarbinol, wherein hydrogen pressure is maintained to be 1.0 to 10.0MPa, hydrogen flow rate is controlled to be 1000 to 20000m<3> / h. According to the production method, benzoic acid and aliphatic straightchain saturated monohydric alcohol are taken as the main raw materials, the phenylcarbinol finished product is prepared via esterification and hydrogenation; finished product composition is stable; purity is high; yield is high; potential safety hazards in halogenation process of the prior art are avoided; a problem that products prepared via a conventional method are impossible to be applied in high-end fields because of containing of chloridion is solved; and the obtained chloride-free phenylcarbinol can be applied in the fields such as food, medicine, and health care products. The invention also discloses a production device adopted in the production method.

Description

technical field [0001] The invention relates to a preparation method of benzyl alcohol, in particular to a production method of chlorine-free benzyl alcohol and production equipment thereof. Background technique [0002] Benzyl alcohol is a very useful fixative, and it is an indispensable spice in the preparation of jasmine, moonshine, ylang-ylang and other flavors. Benzyl alcohol is widely used in the production of industrial chemicals, such as paint solvents; photographic developers; polymers Vinyl chloride stabilizers; cosmetics; food additives; medicine; synthetic resin solvents; solvents for vitamin B injections; preservatives for ointments or liquid medicines, can be used as nylon filaments; desiccants for fibers and plastic films, dyes; cellulose esters ; Solvent for casein. [0003] At present, the method for producing benzyl alcohol by traditional technology is mainly benzyl chloride hydrolysis method, mainly through the azeotropic aqueous solution of benzyl chlori...

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
IPC IPC(8): C07C29/149C07C33/22C07C67/08C07C69/78
CPCC07C29/149C07C67/08C07C33/22C07C69/78
Inventor 周明何
Owner 宁波杰尔盛化工有限公司