Production method and equipment for reducing salt content and solid waste of p-methylphenol

A technology of p-cresol and production method, which is applied in chemical instruments and methods, preparation of organic compounds, water/sludge/sewage treatment, etc. Process flow, reduce unit consumption, and avoid the effect of sewage

Pending Publication Date: 2022-02-01
JINNENG SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems in the prior art that p-cresol is prepared by using the toluene sulfonation alkali fusion method, the product has high salt content, and acidic substances are easily produced duri

Method used

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  • Production method and equipment for reducing salt content and solid waste of p-methylphenol

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Experimental program
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Effect test

Embodiment 1

[0037] A production device for reducing the salt content and solid waste of p-cresol, comprising an alkali-dissolving tank 1, a digester 2, a flash tank 3, a scrubber 8 and a rectifying tank 10. The alkali-dissolving kettle 1 is connected with the digester 2; the digester 2 is connected with the trough 11; the trough 11 is connected with the flash tank 3; the top of the flash tank 3 is connected with the heat exchanger 4, The bottom of the flash tank 3 is connected with the centrifuge 5; the centrifuge 5 is connected with the acidifier 6; the acidifier 6 is connected with the neutralization section 7; the acidifier 6 is connected with the scrubber 8; the scrubber 8 is connected with phenol-water separator 9; said phenol-water separator 9 is connected with rectifying tank 10 and digester 2 respectively; said heat exchanger 4 is connected with scrubber 8; said acidifier 6 is connected with digester 2 .

Embodiment 2

[0039] In the equipment of embodiment 1, carry out the production of a batch of p-cresol, concrete process is as follows:

[0040](1) Digestion section: 500g of sodium p-toluenesulfonate as raw materials, 222g of sodium hydroxide, and an alkali melting temperature of 364°C. After the reaction, the molten sample and water are impregnated in the digester, the amount of impregnation water is 2500g, and the impregnation water is general production water; the impregnation temperature is controlled at 100°C to obtain a high-temperature solid-liquid mixture, which overflows to the digestion tank;

[0041] (2) Flashing section: the high-temperature mixture with a temperature of 363°C is transported to the flash tank through pipelines for flash evaporation, wherein the temperature of the flash tank is controlled at 50°C, and the water vapor after flashing is condensed to 45°C by a heat exchanger , the remaining solid-liquid mixture is pumped into the centrifuge section;

[0042] (3) C...

Embodiment 3

[0048] In the equipment of embodiment 1, carry out the production of a batch of p-cresol, concrete process is as follows:

[0049] (1) Digestion section: 500g of sodium p-toluenesulfonate as raw materials, 225g of sodium hydroxide, and an alkali melting temperature of 357°C. After the reaction, the molten sample and water were dipped in the digester, the amount of dipping water was 2600g, and the dipping water was the liquid separated from step (4) and step (6) in Example 2; the temperature of the dipping was controlled at 97°C to obtain The high-temperature solid-liquid mixture overflows to the digestion tank;

[0050] (2) Flashing section: the high-temperature mixture with a temperature of 363°C is transported to the flash tank through pipelines for flash evaporation, wherein the temperature of the flash tank is controlled at 52°C, and the water vapor after flashing is condensed to 46°C by a heat exchanger , the remaining solid-liquid mixture is pumped into the centrifuge s...

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Abstract

The invention relates to a production method and equipment for reducing salt content and solid waste of p-methylphenol, and belongs to the technical field of chemical industry. The method comprises the following steps: carrying out a melting reaction on sodium p-toluene sulfonate and sodium hydroxide to generate sodium p-methylphenolate, and adding water for dipping to generate a solid-liquid mixture; then pumping into a flash tank for flash evaporation; carrying out solid-liquid separation on the solid-liquid mixture subjected to flash evaporation; introducing sulfur dioxide into the obtained liquid for acidification, and obtaining a p-methylphenol crude product after solid-liquid separation; washing the p-methylphenol crude product with condensed water collected during flash evaporation; and enabling the washed p-methylphenol crude product to enter a rectification section for refining treatment. Compared with an existing traditional production process for reducing the salt content and the solid waste output of p-methylphenol, the method has the remarkable advantages that the salt content and the solid waste output of p-methylphenol are low, the environmental protection effect is good, the process flow is shortened, the operation cost is low, the investment is saved, and the product quality is stable; and the p-methylphenol has higher market competitiveness.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a production method and equipment for reducing the salt content and solid waste of p-cresol. Background technique [0002] p-cresol is an important fine chemical intermediate, mainly used in the synthesis of medicines, pesticides, spices, dyes, antioxidants, polymerization inhibitors, ultraviolet absorbers, fuel additives, rubber additives, etc., and is an important raw material for fine chemicals . The main synthesis methods of p-cresol include toluene sulfonation alkali fusion method, phenol methylation method, isopropyl toluene method, p-toluidine method, etc. Domestic industrial production of p-toluene phenol generally adopts the toluene sulfonation alkali fusion method, which is to sulfonate and neutralize toluene to make sodium p-toluenesulfonate, and then mix sodium p-toluenesulfonate and sodium hydroxide together Heat and melt to generate sodium p-...

Claims

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Application Information

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IPC IPC(8): C02F9/10B01D3/14C07C37/04C07C37/68C07C39/07C07C37/055C02F103/36C02F101/10
CPCC02F9/00B01D3/14C07C37/04C07C37/685C07C37/055C02F1/06C02F1/38C02F1/72C02F1/66C02F2103/36C02F2101/101C07C39/07Y02P20/52
Inventor 刘良良王延兵张丽丽张建社
Owner JINNENG SCI & TECH
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