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NMP (N-Methyl Pyrrolidone) wastewater low-temperature recycling system and method thereof

A recovery system and low-temperature technology, applied in the field of NMP waste water low-temperature recovery system, can solve problems such as high energy consumption and non-compliance with energy-saving and emission-reduction policies, and achieve the effects of improving production efficiency and relieving production pressure

Inactive Publication Date: 2018-06-29
梁沛文
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the recovery of NMP is mainly based on single-effect rectification, but for low-concentration NMP wastewater, if single-effect rectification is still used, the energy consumption will be too high, which does not comply with the national energy-saving and emission-reduction policy

Method used

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  • NMP (N-Methyl Pyrrolidone) wastewater low-temperature recycling system and method thereof
  • NMP (N-Methyl Pyrrolidone) wastewater low-temperature recycling system and method thereof

Examples

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Embodiment 1

[0043] Such as figure 1As shown, a low-temperature recovery system for NMP waste water described in this embodiment includes a first-stage concentration tower 1, a second-stage concentration tower 3, a third-stage concentration tower 5, a vacuum rectification tower 7, and a refining tower 9 connected sequentially through pipelines; The liquid phase outlet of the first-stage concentration tower 1 is connected to the heat medium inlet of the first condenser 11; the liquid-phase outlet of each tower is connected to the liquid-phase feed port of the lower tower; the first-stage concentration tower The liquid-phase feed port of 1 is connected to the refrigerant outlet of the preheater 12 through the feed pipe; the first-stage concentration tower 1, the second-stage concentration tower 3, the third-stage concentration tower 5, the vacuum rectification tower 7 and the refining tower 9 Arranged in a straight line and connected to the reboilers respectively, they are the first-stage r...

Embodiment 2

[0063] A kind of NMP wastewater low-temperature recovery system described in this embodiment comprises a first-level concentration tower 1, a second-level concentration tower 3, a third-level concentration tower 5, a vacuum rectification tower 7 and a refining tower 9 connected sequentially through pipelines; The vapor phase outlet of the first stage concentration tower 1 is connected to the heat medium inlet of the first condenser 11; the liquid phase outlet of each tower is connected to the liquid phase feed port of the lower tower; the liquid phase of the first stage concentration tower 1 The phase feed port is connected to the refrigerant outlet of the preheater 12 through the feed pipe; the first-stage concentration tower 1, the second-stage concentration tower 3, the third-stage concentration tower 5, the vacuum rectification tower 7 and the refining tower 9 are arranged in a ring . A low-temperature recovery method for NMP wastewater is the same as in Example 1.

[006...

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Abstract

The invention provides an NMP (N-Methyl Pyrrolidone) wastewater low-temperature recycling system and a method thereof. The system comprises a first-stage concentration tower, a second-stage concentration tower, a third-stage concentration tower, a vacuum distillation tower and a refining tower which are connected in sequence through pipelines, wherein the gas-phase discharge hole of the first-stage concentration tower is connected with a heating medium inlet of a first condenser; the liquid-phase discharge hole of each tower is connected with the liquid-phase inlet of a tower of a next stage.By using a negative pressure separation method, effective components of a waste liquid can be separated at a low temperature, decomposition of effective components in the separation process is greatlyreduced, and meanwhile functions of energy conservation and consumption reduction can be achieved.

Description

technical field [0001] The invention relates to the field of solvent separation and purification, in particular to a low-temperature recovery system and method for NMP wastewater. technical background [0002] NMP, also known as N-methylpyrrolidone, has a molecular formula of C 5 h 9 NO, it is a colorless transparent oily liquid at normal temperature and pressure, with a slight ammonia odor, hygroscopicity, stable in neutral medium, and easy to decompose in strong alkali / acid. [0003] NMP is a polar aprotic solvent with strong selectivity and good stability, low toxicity, high boiling point, strong solvency, non-flammable, biodegradable, recyclable, safe to use and suitable for a variety of formulation purposes Etc. Miscible with water, soluble in ether, acetone and various organic solvents, stable chemical properties, non-corrosive to carbon steel and aluminum, slightly corrosive to copper. It has the advantages of low viscosity, good chemical stability and thermal sta...

Claims

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Application Information

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IPC IPC(8): C07D207/267C02F1/04C02F103/36
CPCC02F1/048C02F2103/36C02F2301/063C02F2301/08C07D207/267
Inventor 梁沛文黄金艳翟咏昕
Owner 梁沛文
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