Sodium hydrosulfite synthesizing and continuous producing method

Abstract

The invention discloses a sodium hydrosulfite synthesizing and continuous producing method. The sodium hydrosulfite synthesizing and continuous producing method comprises the following steps: taking a synthesizing pot as a tubular reactor; after preparing raw materials AE and ME, transferring the raw materials AE and ME into AE and ME storage tanks via inert gas; adding the raw materials AE and ME in a large synthesis dropwise adding pot; opening the pot and inserting a bottom tube into the large synthesis dropwise adding pot to transfer the materials into a small synthesis dropwise adding pot; keeping the liquid level of the materials in the large dropwise adding pot to be stable relatively in a material transferring process; continuing adding the raw materials AE and ME into the large synthesis dropwise adding pot continuously and uniformly; after the small synthesis dropwise adding pot receives a first batch of materials, enabling a second small dropwise adding pot to begin to receive the material from the large synthesis dropwise adding pot, and enabling the rest dropwise adding pot to begin to receive the material from the large synthesis dropwise adding pot in the same way; continuously adding a SO2-CH3OH solution as a raw material at a suitable speed to an end point by the small dropwise adding pots from the time when the small dropwise adding pots begin to receive the material to the time when reaction reaches the end point; and after insulating and ripening are completed, placing the material in a drying process for subsequent use. A repeated operation process of a reaction process is omitted, so that a synthesis process is continuous, and while the efficiency of the device is improved, consumption of sodium formate and sodium pyrosulfite is reduced.

Description

technical field [0001] The invention belongs to the technical field of production technology of sodium hydrosulfite, and in particular relates to a synthetic and continuous production method of hydrosulfite. Background technique [0002] Hydrosulfite, also known as sodium dithionite, is a white sandy crystal or light yellow powder chemical. Since sulfur is in an intermediate valence state, sodium dithionite has both strong reducing and oxidizing properties. It is mainly used as a bleaching agent in the textile industry and paper industry. It will release a large amount of heat and toxic gases such as hydrogen dioxide and hydrogen sulfide after contacting with water. It is widely used in reduction dyeing, reduction cleaning, bleaching and organic synthesis, wood pulp and paper making and other fields in the textile industry. [0003] Since the method of adding sodium metabisulfite to the production process of sodium formate sodium hydrosulfite was successful in Guangdong Zh...

AI Technical Summary

Problems solved by technology

In October 2013, China Salt Anhui Hongsifang Co., Ltd. applied for a patent for synthesis of continuous large droplet addition (application number 201310501782.2). From the disclosed content, the core is that after each large droplet addition is completed, the small droplet When adding the pot and transferring the material, the material that has completed the large dropwise addition operation is left with a certain volume (2m) by limiting the volume of the transferred material 3 ) material as the base material, and then perform the operation of adding AE and ME dropwise in the process of synthetic large dropwise addition, which cannot be regarded as continuous in the true sense.

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