The invention relates to a method for producing
chlorosulfonyl isocyanate by taking
cyanogen chloride and
sulfur trioxide as raw materials, belonging to the methods for producing
chlorosulfonyl isocyanate. The method comprises the following steps: feeding the raw materials into a tubular reactor at a theoretical
molar ratio, enabling the raw materials to react continuously in the tubular reactor, feeding the by-products of reaction into a tubular
thermal decomposition reactor of by-products, continuously converting the by-products of reaction to the desired product, separating the crude product, and purifying to obtain the high-purity
chlorosulfonyl isocyanate. The method provided by the invention can realize the production of the chlorosulfonyl
isocyanate through
continuous reaction in the tubular reactor, and the method has the advantages of low investment in devices, high production efficiency and strong production capacity. The advanced production process is adopted to produce the chlorosulfonyl
isocyanate, a few by-products are generated during reaction in the tubular reactor, and the by-products can be completely converted into the target product through
thermal decomposition reaction. No by-product is sent out of the bound in addition to the impurities involved into the raw materials in the production process, the
utilization rate of the raw materials is high, the product has high quality, the production process is stable, and the method is easy to operate and has large operating flexibility.