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A method for reducing a sodium salt content of an alkaline-solution-containing crude alcohol ketone material

A lye and material technology, applied in the field of sodium salt removal in crude alcohol and ketone materials, can solve the problems of high energy consumption, large process water usage, incomplete sodium salt separation, etc., to prolong the operation period and reduce the output of waste water. , the effect of prolonging the driving cycle

Active Publication Date: 2018-01-05
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 a sodium salt content of an alkaline-solution-containing crude alcohol ketone material

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Effect test

Embodiment 1

[0045] A cyclohexanone plant with an annual output of 80,000 tons has a ventilation volume of about 14,000Nm 3 / h, the alkalinity of saponification is about 0.95mol / kg, and the amount of crude alcohol ketone material entering the saponification system is 12t / h, which is processed by the crude alcohol ketone material desalination device of the present invention, and the pressure difference between the inlet and outlet of the cyclone separator is 0.2MPa , the average washing volume of the salt extraction tower is 3.5m 3 / h, the average content of sodium ions in the alcohol and ketone materials from the salt extraction tower is 6ppm, and the amount of waste 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 water washing volume of the salt extraction tower is 4.0m 3 / h, the average content of sodium ions in the alkanol and ...

Embodiment 2

[0048] A cyclohexanone plant with an annual output of 80,000 tons, with a ventilation volume of 14,000Nm 3 / h, the alkalinity of saponification is 0.95mol / kg, and the amount of crude alcohol ketone material entering the saponification system is 12t / h, which is processed by the crude alcohol ketone material desalination device of the present invention, and the pressure difference between the inlet and outlet of the cyclone separator is 0.15MPa, The average washing volume of the salt extraction tower is 3.25m 3 / h, the average content of sodium ions in the alcohol and ketone materials coming out of the salt extraction tower material is 7ppm, and the amount of waste 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 has a ventilation volume of about 14,000Nm 3 / h, the alkalinity of saponification is 0.95mol / kg, the amount of crude alcohol ketone material entering the saponification system is about 12t / h, the material coming out of the saponification system is processed by the sodium salt removal device of the present invention, and the alcohol ketone material is separated by sedimentation The residence time in the tower is 1 hour, and the average washing volume of the salt extraction tower is 3m 3 / h, the average content of sodium ions in the alcohol and ketone materials coming out of the salt extraction tower material is 6.5ppm, and the average waste alkali amount sent to the waste alkali evaporation process is 11m 3 / h, the operation cycle of the device is more than 12 months.

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

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Abstract

The invention discloses a method for reducing a sodium salt content of an alkaline-solution-containing crude alcohol ketone material. According to the method, a desalting device is utilized to desaltthe crude alcohol ketone material. The desalting device includes a mixing tank, a two-phase separator and a salt extraction column which are connected in order through pipelines. After the crude alcohol ketone material is fully mixed in the mixing tank, the crude alcohol ketone material is pumped into the two-phase separator to allow an alcohol ketone organic phase and an alkaline solution aqueousphase to be separated, the alkaline solution aqueous phase is discharged from the bottom of the two-phase separator, the alcohol ketone organic phase is fed into the lower part of the salt extractioncolumn from the top of the two-phase separator, and is brought into countercurrent contact with process water entering the salt extraction column from the upper part of the salt extraction column toachieve water washing, an obtained alcohol ketone material is discharged from the top of the salt extraction column, and a water washing liquid is discharged from the bottom of the salt extraction column. The sodium salt content of the crude alcohol ketone material can be reduced to 10 mg / kg or below by the method, 0.2-2 m<3> / h of the process water can be saved, the water retention volume in equipments is reduced, and energy consumption of equipment is reduced.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(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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