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A method for reducing sodium salt content in lye-containing crude alcohol and ketone material

A technology of lye and materials, which is applied in the field of sodium salt removal in crude alcohol and ketone materials, can solve the problems of high energy consumption, large amount of process water consumption, and incomplete separation of sodium salts, etc., so as to prolong the operation cycle and reduce the output of waste water , the effect of saving process water

Active Publication Date: 2021-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the desalination process of crude alcohol and ketone materials containing lye after saponification in the prior art, there are defects such as incomplete separation of sodium and salt, high energy consumption, and large amount of process water consumption; the purpose of the present invention is to provide a low water consumption, high energy The method is low in consumption, simple in operation, and can efficiently realize the removal of sodium salts in crude alcohol and ketone materials containing lye. This method meets the requirements for sodium ion content in crude alcohol and ketone materials containing lye in industrial production, and is conducive to popularization and use.

Method used

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  • A method for reducing sodium salt content in lye-containing crude alcohol and ketone material

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Effect test

Embodiment 1

[0045] A cyclohexanone plant with an annual output of 80,000 tons, with a ventilation volume of about 14,000 Nm 3 / h, the alkalinity of saponification is about 0.95mol / kg, the amount of crude alcohol and ketone material entering the saponification system is 12t / h, and the crude alcohol and ketone material desalination device of the present invention is used for processing, and the pressure difference between the inlet and outlet of the cyclone separator is 0.2MPa , the average water washing volume of the salt extraction tower is 3.5m 3 / h, the average sodium ion content in the alcohol and ketone material from the salt extraction tower is 6ppm, and the amount of spent alkali sent to the waste alkali evaporation process is 11.5m 3 / h, the driving cycle can be increased to more than 12 months.

[0046] If the salt extraction tower is directly used for treatment, the average washing volume of the salt extraction tower is 4.0m 3 / h, the average sodium ion content in the alcohol a...

Embodiment 2

[0048] A cyclohexanone plant with an annual output of 80,000 tons, with a ventilation volume of 14,000 Nm 3 / h, the alkalinity of saponification is 0.95mol / kg, the crude alcohol and ketone material amount that enters saponification system is 12t / h, adopts crude alcohol and ketone material desalination device of the present invention to handle, and the cyclone separator inlet and outlet pressure difference is 0.15MPa, The average water washing volume of the salt extraction tower is 3.25m 3 / h, the average content of sodium ions in the alcohol and ketone material from the salt extraction tower is 7ppm, and the amount of spent alkali sent to the waste alkali evaporation process is 11.5m 3 / h, the driving cycle can be increased to more than 12 months.

Embodiment 3

[0050] A cyclohexanone plant with an annual output of 80,000 tons, with a ventilation volume of about 14,000 Nm 3 / h, the alkalinity of saponification is 0.95mol / kg, and the crude alcohol and ketone material amount that enters saponification system is about 12t / h, and the material that saponification system comes out adopts sodium salt removing device of the present invention to process, and alcohol and ketone material is separated in settling The residence time in the tower is 1 hour, and the average water washing volume of the salt extraction tower is 3m 3 / h, the average sodium ion content in the alcohol and ketone material coming out of the salt extraction tower material is 6.5ppm, and the average amount of spent alkali sent to the waste alkali evaporation process is 11m 3 / h, the operating period of the device is more than 12 months.

[0051] The material from the saponification system is processed by a separate salt extraction tower, and the average washing volume of th...

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Abstract

The invention discloses a method for reducing the sodium salt content in crude alcohol and ketone materials containing lye. The method uses a desalination device to desalt the crude alcohol and ketone materials containing lye; the desalination device includes a mixing tank connected by pipelines, a two-phase Separator and salt extraction tower, after the crude alcohol and ketone material containing lye is mixed in the mixing tank, it is pumped into the two-phase separator to separate the organic phase of alcohol and ketone from the water phase of lye; the water phase of lye is separated from the two-phase The bottom of the separator is discharged; the alcohol and ketone organic phase enters the lower part of the salt extraction tower from the top of the two-phase separator, and is countercurrently contacted with the process water entering the upper part of the salt extraction tower for water washing, and the obtained alcohol and ketone material is discharged from the top of the salt extraction tower, and the obtained The washing liquid is discharged from the bottom of the salt extraction tower. This method can reduce the sodium ion content in the lye-containing alcohol and ketone material below 10mg / kg, and save process water by 0.2-2m 3 / h, reduce the stagnation of water in the device, and reduce the energy consumption of the device.

Description

technical field [0001] The invention relates to a method for removing sodium salt in crude alcohol and ketone materials, in particular to a method for reducing the content of sodium salt in crude alcohol and ketone materials containing lye by designing a special desalination device for crude alcohol and ketone materials, belonging to cyclohexene Ketone production technology field. Background technique [0002] In the production process of cyclohexanone, in addition to cyclohexanol, cyclohexanone and cyclohexyl hydroperoxide, the oxidation products formed by the oxidation of cyclohexane and air also contain many other substances, such as esters, acids, aldehydes, etc.; The oxidation liquid in the decomposition kettle is treated with aqueous sodium hydroxide solution, and cyclohexyl hydroperoxide is decomposed to generate cyclohexanone and cyclohexanol, the acid is neutralized, and the esters are saponified to generate organic acid sodium salt and cyclohexanol. The ketones an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/76C07C29/86C07C35/08C07C45/78C07C45/80C07C49/403
Inventor 张晓辉周袁煜孙洁华余兴胡璐
Owner CHINA PETROLEUM & CHEM CORP
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