System for reutilizing bromomethane by vacuum heating

Abstract

The invention relates to a system for reutilizing bromomethane by vacuum heating, which comprises a heating cavity, a closed fumigation facility, a valve, a vacuum pump and pipelines, wherein a plurality of carbon material packed columns are arranged in the heating cavity, and the structure of each carbon material packed column is a cylinder with a cavity; the carbon material packed columns are connected in parallel and communicated; the upper communicating pipeline is led out of the upper part of the heating cavity and then connected with the vacuum pump, passes through the vacuum pump and is further connected to an upper pipeline interface of the closed fumigation facility; the lower communicating pipeline is led out of the lower part of the heating cavity and then connected with a circulating fan, passes through the circulating fan and is further connected to a lower pipeline interface of the closed fumigation facility; the carbon material packed columns adopt the vertical placement, thereby effectively solving the difficult problems of non-uniform distribution of activated carbon or carbon fibers, and difficulty in replacement of the activated carbon or the carbon fibers; the vacuum pump is adopted for vacuum-pumping of the carbon material packed columns, and then the bromomethane adsorbed in carbon material is heated for desorption, thereby improving the desorption effectand reducing the heating desorption temperature; and the bromomethane which is desorbed by vacuum heating can be directly discharged to the fumigation facility with goods to be fumigated, thereby reducing the reutilizing cost of the bromomethane.

Description

technical field [0001] The invention relates to the technical field of chemical treatment, in particular to a vacuum heating and recycling system for methyl bromide; the system is used for the recovery and reuse of methyl bromide after fumigation treatment of methyl bromide, and in particular, the method of vacuum heating is used to realize the recycling of methyl bromide. Background technique [0002] Methyl bromide is currently the most widely used fumigant in fumigation treatment in the world. Methyl bromide has the characteristics of widely killing insects, nematodes, germs and weeds, but because methyl bromide has a damaging effect on the ozone layer in the atmosphere, it was included in the controlled substances of the Amendment to the Montreal Protocol on Substances that Deplete the Ozone Layer in 1992 list. In order to reduce the damage to the ozone layer caused by the emission of methyl bromide after fumigation, it is necessary to study the technology for t...

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Problems solved by technology

[0004] In the above patents, there are problems such as poor desorption effect of methyl bromide, low purity of methyl bromide recovered to steel cylinders and inconsistent purity each time, high operation requirements for condensation recovery to steel cylinders, high requirements for air tightness of equipment, and inconvenient replacement of activated carbon.

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