Production process of sodium metabisulfite

Abstract

The invention relates to a production process of sodium metabisulfite. The production process of the sodium metabisulfite comprises the following procedures: sulfur melting, incineration, waste heat recovery, washing and purification, absorption, drying and packaging and tail gas treatment, wherein the procedure of sulfur melting comprises the following steps: firstly, separating sulfur foam to obtain a sulfur paste and a clear liquid, drying the sulfur paste, conveying into the incineration procedure, separating the clear liquid to obtain condensate and mixed salt, feeding back the condensatefor desulfuration, drying the mixed salt, and conveying into the incineration procedure; the incineration procedure comprises the following steps: mixing the dried sulfur paste and the mixed salt with air conveyed by an air blower, carrying out combustion to obtain a sulfur dioxide containing process gas, and conveying the process gas into the waste heat recycling procedure. The production process of the sodium metabisulfite has the beneficial effects that the sulfur foam is adopted as a raw material to produce the sodium metabisulfite, then sulfur sources in the sulfur foam can be effectively reused, and a function of resource conservation can be achieved.

Description

technical field [0001] The invention relates to chemicals, in particular to a production process of sodium pyrosulfite. Background technique [0002] Sodium metabisulfite is often used as a bleaching agent for food, as a nutrient retaining agent for dehydrated vegetables, as a preservative for storing fruits, as a preservative for brewing beverages, and as an intermediate in chemical synthesis. [0003] The Chinese patent with publication number CN105293533A discloses a method for producing sodium metabisulfite by pure oxygen method. The method for producing sodium pyrosulfite includes the following steps: melting sulfur and filtering it into liquid, then feeding liquid sulfur and pure oxygen into a sulfur incinerator for incineration, cooling, and pickling to obtain high-purity SO 2 gas, SO 2 The gas reacts with the liquid alkali in the sodium sulfite reactor to form sodium sulfate crystals, which are separated by centrifugation to obtain sodium sulfite. Sodium sulfite i...

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Problems solved by technology

And how to use the sulfur foam produced by the desulfurization of coking enterprises to produce sodium metabisulfite has not yet been reported.

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