Environment-friendly efficient reaction and solvent rectification recovery system

Abstract

The invention relates to an environment-friendly efficient reaction and solvent rectification recovery system, which comprises a feeding pump, a first rectification system, a second rectification system, a solvent metering tank, a dissolving kettle, a resin kettle and a plurality of defoaming kettles. After the raw material inlet enters the first rectification system and the second rectification system through the feed pump, a solvent produced by rectification enters the solvent metering tank through a solvent feeding pipe; the solvent metering tank, the dissolving kettle, a resin kettle and aplurality of defoaming kettles are connected in sequence; a central shaft is arranged in the solvent metering tank and is connected with a motor; and an upper stirrer, a middle stirrer and a lower stirrer are arranged on the central shaft from top to bottom. The solvent is recycled more environmentally friendly and efficiently, meanwhile, waste water and waste residues are recycled, and the environment is protected; in the resin reaction, the dissolving kettle with an adjustable stirring device is adopted, so that solvents are fully mixed, the resin is promoted to fully react, the energy consumption is reduced, and the reaction efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to an environment-friendly, high-efficiency reaction and solvent rectification recovery system. Background technique [0002] Dimethylacetamide solvent is needed in the production of PI membranes. In the production process of PI membranes, dimethylacetamide only participates in the role of dissolved solutes in the process chain, and must be recovered and recycled afterwards. However, in the traditional recovery method, since the solvent content obtained after recovery is not high (concentration ~70%), the recovered solvent cannot be used directly (99.95% of the national standard), so most manufacturers of PI membranes, The recovered solvent is sent back to the solvent manufacturer for rectification. At present, the manufacturers of dimethylacetamide used in the whole country all use the traditional distillation tower process for rectification, but this process has the d...

AI Technical Summary

Problems solved by technology

However, in the traditional recovery method, since the solvent content obtained after recovery is not high (concentration ~70%), the recovered solvent cannot be used directly (99.95% of the national standard), so most manufacturers of PI membranes, The recovered solvent is sent back to the solvent manufacturer for rectification

At present, the manufacturers of dimethylacetamide used in the country all use the traditional distillation tower process for rectification, but this process has the disadvantages of large investment and low efficiency, especially the waste water produced cannot be treated

[0003] The recovered solvent is used in the catalytic synthesis reaction of the resin, and the dissolution tank is used for stirring and mixing of various solvents. The stirrer used in the common dissolution tank cannot fully mix the solvents, especially the solvent that sinks to the bottom of the tank, which has a certain Viscous, long-term insufficient stirring, and excessive viscosity will increase resistance, increase energy consumption, easily cause mechanical failure, and affect the next reaction, reducing production efficiency

Images