Novel dewatering system for production of methoxy-1-methylethylacetate

Abstract

The invention provides a novel dewatering system for production of methoxy-1-methylethylacetate. The dewatering system comprises a column reactor reboiler, wherein a gas phase mouth of the column reactor reboiler is connected with a lateral gas phase mouth of an atmospheric distillation column by virtue of a pipeline A; a liquid phase mouth of the column reactor reboiler is connected with a liquidphase mouth at the column bottom of the atmospheric distillation column by virtue of a pipeline B; a gas phase mouth in the top of the atmospheric distillation column is connected with a gas phase inlet of an overhead condenser by virtue of a pipeline D; a liquid phase outlet in the bottom of the atmospheric distillation column is connected with an inlet of a column bottom extraction pump by virtue of a pipeline C; a condensate extraction opening of the overhead condenser is connected with a feeding hole of a split phase tank by virtue of a pipeline E; a lateral extraction opening of the split phase tank is connected with a feeding hole of a return tank by virtue of a pipeline F; a discharging hole of the split phase tank is connected with an inlet of a return pump by virtue of a pipelineG; an outlet pipeline of the return pump is connected with a reflux inlet of a rectifying column by virtue of a pipeline H; wastewater is extracted by an extraction opening at the tank bottom of thesplit phase tank by virtue of a pipeline K. According to the novel dewatering system disclosed by the invention, the environmental protection requirement is met, energy consumption is not increased ina main process, and the energy consumption is reduced in an after-treatment process.

Description

technical field [0001] The invention relates to the technical field of fine chemicals production, in particular to a novel dehydration system for the production of propylene glycol methyl ether acetate. Background technique [0002] With the rapid development of the global economy, while the chemical industry has created wealth for human beings, it has also caused many negative impacts on the environment on which human beings depend, especially in terms of energy depletion and environmental degradation. my country is also constantly calling for enterprise reform and transformation. While the state is compulsorily shutting down some high-energy-consuming and high-polluting enterprises, it also requires some enterprises with transformational value to innovate independently, encourages the use of new energy or energy-saving processes to replace high-energy-consuming processes, and encourages Environmentally friendly processes are used instead of polluting processes. [0003] Pr...

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Problems solved by technology

[0004] As an environment-friendly organic solvent, propylene glycol methyl ether acetate itself adapts to the requirements of international environmental protection laws and replaces the application of glycol ether acetate, a toxic organic solvent with similar solubility properties, in high-grade coatings. Therefore, the production The process should be more environmentally friendly, and our traditional production process will use a toxic benzene as an entrainer in the dehydration process, and this entrainer will consume a lot of energy in the subsequent recovery process, especially It is difficult to treat the tail gas containing benzene vapor by absorption or biochemical treatment, and the environmental protection law has much stricter requirements on the discharge index of benzene-containing tail gas than the emission index of low-toxic solvents in tail gas

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