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Continuous extraction method reclaims the method for methyl ester in esterification waste liquid

An extraction method and esterification technology, which is applied in the field of continuous extraction method to recover methyl ester from esterification waste liquid, can solve the problems of hidden safety and environmental protection, unstable process parameters, high labor intensity, etc., and achieve the elimination of hidden safety and environmental protection hidden dangers. , the effect of reducing the incidence of occupational diseases and reducing labor intensity

Active Publication Date: 2016-01-13
CHINA PINGMEI SHENMA GRP KAIFENG XINGHUA FINE CHEM
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Problems solved by technology

The above-mentioned intermittent extraction process of pure benzene is easy to cause leakage of pure benzene, which not only causes waste of pure benzene, but also has hidden safety and environmental protection risks, and pure benzene is a toxic and harmful substance, and leakage of pure benzene is likely to cause harm to the health of the staff. occupational disease
Using the above-mentioned pure benzene batch extraction process to recover methyl ester requires continuous manual feeding and discharging, which is labor intensive and unstable process parameters

Method used

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  • Continuous extraction method reclaims the method for methyl ester in esterification waste liquid

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Embodiment Construction

[0015] The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing,

[0016] In the accompanying drawings, the equipment used in the present invention is: the first extraction tank 1 communicates with the second extraction tank 2, the third extraction tank 3 and the fourth extraction tank 4 in sequence. The fourth extraction tank 4 communicates with the ground pool that is connected with the ground pool pump, and the first extraction tank 1 is connected with the esterification waste liquid feed pump 8 through the flow meter 10 connected thereto and the esterification waste liquid feed valve 9, and , the first extraction tank 1 is connected with the secondary settling tank 18 through the secondary settling tank feed valve 17, and is also connected with the pure benzene pump 11 through the pure benzene inlet valve 13 and the pure benzene flow meter 12, and the pure benzene pump 11 It is connected to the pure benzene stor...

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Abstract

The invention relates to a method for recovering methyl ester in a waste esterified solution by continuous extraction process. The waste esterified solution is continuously fed into an extraction tank and continuously extracted with pure benzene to recover methyl ester in the waste esterified solution. By virtue of the method disclosed by the invention, the stability of process parameters can be improved, the potential safety and environmental hazards can be also eliminated, the incidence rate of the occupational disease is reduced and the labor strength of workers can be greatly reduced. Since the environment for continuously extracting methyl ester is stable, the good extraction effect is achieved, the recovery rate of methyl ester can be improved and the recovery rate of methyl ester is increased from the original about 3.3% to about 3.9%.

Description

technical field [0001] The invention relates to a method for recovering the methyl ester in the esterification waste liquid, in particular to a method for recovering the methyl ester in the esterification waste liquid by a continuous extraction method. It can overcome the deficiencies of the existing technology, and it is suitable for the esterification of semi-finished methyl anthranilate (hereinafter referred to as methyl ester) in the production process of saccharin to generate esterification liquid after sedimentation and separation of methyl ester. Recovery of methyl esters contained in waste liquid. Background technique [0002] The semi-finished product methyl anthranilate (hereinafter referred to as methyl ester) in the production process of saccharin, after the esterification liquid generated during the esterification reaction, after the methyl ester is separated by sedimentation, the esterification waste liquid still contains about 1.2% formazan The esters can be ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C227/40C07C229/56
Inventor 杨国新齐枫楠祝新红赵利宽郭广生张玉霞韩培超张会敏
Owner CHINA PINGMEI SHENMA GRP KAIFENG XINGHUA FINE CHEM
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