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Method for processing methanol rectified raffinate

A technology of methanol rectification and treatment method, which is applied in the field of treatment of methanol rectification raffinate, which can solve the problems of high operating cost and large investment, and achieve the effects of resource saving, high degree of automation and elimination of original pollutants

Inactive Publication Date: 2010-06-02
SHANXI LANHUADANFENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The anaerobic-aerobic treatment process has a better effect on the methanol distillation residue, and the effluent can meet the discharge standard, but the process has a large investment, high operating costs, and there is a large waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Send the remaining methanol rectification residue after methanol rectification to the waste water storage tank, keep the liquid level of the waste water storage tank at 1 / 3, after being pressurized by the feed pump, pass through the preheater, and the liquid discharged from the bottom of the distillation tower Heat exchange, preheat to 90-105°C, enter the distillation tower from the entrance in the middle of the distillation tower. The preheated methanol rectification raffinate entering the distillation tower performs heat and mass exchange with the evaporation gas at the bottom of the distillation tower in the packing layer in the middle of the distillation tower, and part of it descends to the bottom of the tower as liquid heavy component I to form the bottom liquid of the distillation tower, and part of it forms Vaporize the light component I and rise to the packing layer at the top of the distillation tower. The vaporized light component I exchanges heat and mass wi...

Embodiment 2

[0025] Send the remaining methanol rectification residue after methanol rectification to the waste water storage tank, keep the liquid level of the waste water storage tank at 3 / 4, after being pressurized by the feed pump, pass through the preheater, and the liquid discharged from the bottom of the distillation tower Heat exchange, preheat to 100-110°C, enter the distillation tower from the entrance in the middle of the distillation tower. The preheated methanol rectification raffinate entering the distillation tower performs heat and mass exchange with the evaporation gas at the bottom of the distillation tower in the packing layer in the middle of the distillation tower, and part of it descends to the bottom of the tower as liquid heavy component I to form the bottom liquid of the distillation tower, and part of it forms Vaporize the light component I and rise to the packing layer at the top of the distillation tower. The vaporized light component I exchanges heat and mass w...

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PUM

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Abstract

The invention discloses a method for processing methanol rectified raffinate. The method comprises the following steps of: separating out the methanol, the alcohol and the fusel oil by a distillation method on the basis of the principle that water, methanol, alcohol, fusel oil, high carbon chain wax oil, and the like have different boiling points and volatility at the same temperature to; separating out the paraffinoil on the basis of the characteristic that water and parainoil can not be dissolved mutually and the density difference between the water and paraffinoil is large; filtering out insoluble suspended solids by a sand filtration method; and finally obtaining recovery liquid which is used for a synthetic relief gas washing tower or extractive distillation. The method for processing methanol rectified raffinate not only eliminates pollutant but also changes waste material into things of value, thereby not only being environmentally-friendly but also having certain economic benefit.

Description

technical field [0001] The invention belongs to a treatment method for waste liquid produced in the chemical production process, in particular to a treatment method for methanol rectification raffinate. Background technique [0002] Methanol rectification raffinate is the bottom raffinate of the rectification tower in the process of methanol rectification. The main component of methanol rectification raffinate is water, and also contains a small amount of lower alcohols such as methanol, ethanol, and n-propanol, and other alcohols Impurities (mainly fatty alcohols) have large COD values, are irritating and cytotoxic, and cannot be discharged directly as general wastewater, otherwise they will cause greater environmental pollution. [0003] The treatment of methanol rectification raffinate is relatively difficult. At present, the common treatment methods for methanol rectification raffinate are as follows: one is to carry out sand filtration, that is, simple separation of sus...

Claims

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Application Information

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IPC IPC(8): C02F9/10C07C29/80C07C31/04C07C31/08C02F1/04C02F1/40
Inventor 董五林李保明王保进牛国芳
Owner SHANXI LANHUADANFENG CHEM
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