Dehydration technology and device for salicylic acid intermediate sodium phenoxide

A technology of sodium phenolate and dehydration device, which is applied in the chemical industry, preparation of organic compounds, sustainable manufacturing/processing, etc. The effect of environmental improvement, simple dehydration process, and reduced usage

Inactive Publication Date: 2015-10-28
SHANDONG XINHUA PHARMA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Salicylic acid product is a bulk raw material product. Due to the long dehydration time under normal pressure, the steam consumption is huge and the heat utilization rate is low.

Method used

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  • Dehydration technology and device for salicylic acid intermediate sodium phenoxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 3530L of phenol aqueous solution with a concentration of 66.04g / mL and 1480L of 73.3g / mL sodium hydroxide aqueous solution are formulated into a sodium phenoxide solution with a concentration of 59.50g / mL and a volume of 5000L, and the sodium phenoxide preparation tank is heated to 90 by steam ℃; when the vacuum degree of the membrane evaporator, condensed water recoverer, and concentrated sodium phenate collector reaches 0.05Mpa, open the regulating valve and turn on the rotameter to control the feed rate of each membrane evaporator at 1000L / h, Four film evaporators are used to operate in parallel; the vapor pressure of the film evaporator is controlled at 0.3Mpa; the content of concentrated sodium phenate is 80.07wt%.

Embodiment 2

[0029] 21950L of phenol aqueous solution with a concentration of 60.24g / mL and 8080L of 70.31g / mL sodium hydroxide aqueous solution are formulated to form a sodium phenate solution with a concentration of 54.47g / mL and a volume of 30030L, and the sodium phenate preparation tank is heated to 93 by steam ℃; when the vacuum degree of the film evaporator, outlet water receiver, and concentrated sodium phenate receiver system reaches 0.078Mpa, turn on the feeding cock and the flow meter cock, so that the feeding speed of each film evaporator is controlled at 1500L / h, open four units at the same time; the vapor pressure of the film evaporator is controlled at 0.4Mpa; the content of concentrated sodium phenate is 90.27wt%.

Embodiment 3

[0031] 35000L of phenol aqueous solution with a concentration of 64.24g / mL and 13520L of 71.5g / mL sodium hydroxide aqueous solution are formulated into a sodium phenoxide solution with a concentration of 57.18g / mL and a volume of 48500L, and the sodium phenoxide preparation tank is heated to 95 by steam. ℃; when the vacuum degree of the film evaporator, outlet water receiver, and concentrated sodium phenate receiver system reaches 0.095Mpa, turn on the feeding cock and the flow meter cock, so that the feeding speed of each film evaporator is controlled at 2000L / h, open four sets at the same time; the vapor pressure of the film evaporator is controlled at 0.5Mpa; the content of concentrated sodium phenate is 94.87wt%.

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Abstract

The invention relates to a dehydration technology and device for salicylic acid intermediate sodium phenoxide and belongs to the technical field of dehydration of sodium phenoxide. According to the dehydration technology for the salicylic acid intermediate sodium phenoxide, a prepared sodium phenoxide solution is heated, then a vacuum feeding manner is adopted, the sodium phenoxide solution is delivered to a membrane evaporator for evaporation dehydration, and steam in the membrane evaporator is collected after being condensed. With the adoption of the dehydration technology for the salicylic acid intermediate sodium phenoxide, the technology time is shortened and the heat utilization efficiency is improved; the dehydration device for the salicylic acid intermediate sodium phenoxide is simple to design, scientific and reasonable.

Description

technical field [0001] The invention relates to a dehydration process and device for sodium phenate, a salicylic acid intermediate, and belongs to the technical field of sodium phenate dehydration. Background technique [0002] Salicylic acid has a wide range of uses and is currently an extremely important pharmaceutical and chemical raw material. It is mainly used to manufacture antipyretic and analgesic drugs aspirin, and it is also an important Raw materials for drug production synthesis. The domestic market size of salicylic acid alone is about 20,000 tons. my country is the main producer and exporter of salicylic acid derivatives such as aspirin and methyl salicylate in the world. Therefore, the use of salicylic acid is huge, so the development A process with short process time, simple operation and environmental friendliness is very necessary. [0003] The traditional synthesis process of salicylic acid is to produce sodium phenate by reacting phenol or phenol aqueous...

Claims

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Application Information

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IPC IPC(8): B01D1/22B01D1/30C07C39/235C07C37/70
CPCY02P20/10
Inventor 吴孝好何雪涛徐文辉吴迪
Owner SHANDONG XINHUA PHARMA CO LTD
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