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Double-effect evaporation method for crude toluene mixed solution and device using double-effect evaporation method

A double-effect evaporation and mixed solution technology, which is applied in multi-effect evaporation, separation methods, chemical instruments and methods, etc., can solve the problems of wasting water source and requiring more heat for direct crude toluene heating, so as to improve the utilization rate and save energy. , the effect of saving water

Active Publication Date: 2013-01-23
YANTAI DONGJIE ENVIRONMENTAL PROTECTION MACHINERYENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a double-effect evaporation method for crude toluene mixed solution, to overcome the existing single-effect evaporation, the toluene vapor needs to be cooled by circulating cooling water, wasting water, and requires more direct heating of crude toluene heat defect

Method used

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  • Double-effect evaporation method for crude toluene mixed solution and device using double-effect evaporation method
  • Double-effect evaporation method for crude toluene mixed solution and device using double-effect evaporation method

Examples

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Embodiment 1

[0032] Example 1: A double-effect evaporation method for a crude toluene mixed solution. The crude toluene solution with a temperature of 30°C and containing 1.5% (wt) polyethylene passes through the heat exchanger 5, and the temperature rises to 70°C. N3 enters the tube pass of the second-effect evaporator 3 for evaporation, the temperature of the second-effect evaporator 3 is 70-90°C, and the operating pressure is 45-60KPa (A); the second-effect toluene vapor overflows through the outlet N4 at the top of the second-effect evaporator 3, It enters the condenser 4 through the second-effect toluene steam output pipe, is condensed by circulating cooling water, and then discharged after being cooled; the toluene concentrated liquid flows out through the bottom of the second-effect evaporator 3 and enters the first-effect evaporator 1 through the pump 2 from the concentrated toluene inlet at the lower part of the first-effect evaporator 1. Tube side of effect evaporator 1. Wherein ...

Embodiment 2

[0035] Example 2: A double-effect evaporation method for a crude toluene mixed solution. The crude toluene solution containing 2.0% (wt) polyethylene at a temperature of 30°C is heated by the heat exchanger 5, and the temperature rises to 70°C. N3 enters the second-effect evaporator 3 for evaporation, the temperature of the second-effect evaporator 3 is 80°C, and the operating pressure is 55KPa (A); the second-effect toluene vapor overflows through the top of the second-effect evaporator, and passes through the second-effect toluene vapor output pipe Enter the condenser 4, be discharged after being condensed by circulating cooling water; the toluene concentrated liquid flows out through the bottom of the second-effect evaporator 3 and enters the tube side of the first-effect evaporator 1 through the pump 2 from the concentrated toluene inlet at the lower part of the first-effect evaporator. Wherein the polyethylene content in the toluene concentrate is 5.5% (wt), and the temper...

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Abstract

The invention relates to a double-effect evaporation method for a crude toluene mixed solution and a device using the double-effect evaporation method. Crude toluene enters a double-effect evaporator from a double-effect evaporator material inlet for evaporating; the double-effect toluene vapour overflows from the top part of the double-effect evaporator; a toluene concentrated solution flows out from the bottom of the double-effect evaporator and enters a single-effect evaporator from a concentrated toluene inlet on the lower part of the single-effect evaporator through a pump; the toluene concentrated solution inside the single-effect evaporator is distilled, so that single-effect toluene vapour overflows from the top part of the single-effect evaporator; toluene raffinate is discharged from an overflow port at the middle part of the single-effect evaporator; the single-effect toluene vapour enters a shell side of a heat exchange part of the double-effect evaporator from a single-effect toluene vapour pipeline, and performs heat exchange with the crude toluene in the double-effect evaporator, so that the crude toluene is heated and gasified, is overflown from the top part of the double-effect evaporator, and enters a condenser from a double-effect toluene vapour output tube, so as to be discharged after being condensed and cooled by circulating cooling water. The method uses double-effect evaporation, so an energy-saving effect is remarkable.

Description

technical field [0001] The invention relates to a double-effect evaporation method and a device used, in particular to a double-effect evaporation method and a device used for a crude toluene mixed solution. Background technique [0002] Microfiber synthetic leather is the third generation of artificial leather after PVC leather and ordinary PU leather. It has a structure and performance similar to that of bundled collagen fibers in natural leather, and is the development direction of artificial leather. Superfine fiber synthetic leather means that the base fabric used in the production of synthetic leather is superfine fiber (generally, the fiber with a fineness of 0.3 denier, that is, a fiber with a diameter of less than 5 microns is called superfine fiber), and its air permeability and wear resistance are relatively good. [0003] In the production of microfiber synthetic leather, the base fabric used is non-woven fabric, which is made of synthetic fibers of nylon and pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D1/26B01D3/00C07C15/06C07C7/00
CPCY02P20/10
Inventor 张景铸刘书庆高大友贾磊刘坤
Owner YANTAI DONGJIE ENVIRONMENTAL PROTECTION MACHINERYENG
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