New process for preparing sodium thiocyanate
Sodium thiocyanate, a new process technology, applied in the direction of thiocyanate, etc., can solve the problems of inability to eliminate environmental pollution, low purity of sodium thiocyanate, water source pollution, etc., achieve a wide range of industrial applications, low raw material costs, reduce The effect of production costs
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[0033] A new process for preparing sodium thiocyanate includes the following steps:
[0034] 1) Methanol dissolves
[0035] Take the coking gas PDS desulfurization mixed salt as the raw material; firstly, the coking desulfurization waste liquid is evaporated to dryness to obtain a mixed salt containing sodium thiocyanate, sodium sulfate and sodium thiosulfate, the mixed salt is crushed into a block, and the raw material is methanol The methanol in tank 3 and the qualified methanol tank 2 recovered by rectification is pumped into methanol mixing tank 1, ensuring that the methanol content in the mixing tank is ≥98%, and then adding 2 tons of methanol from methanol mixing tank 1 to dissolving tank 4. Then add 1.44 tons of crushed mixed salt, heat to 50°C with steam, stir for 2 hours at a speed of 70r / min to obtain a solution.
[0036] 2) Nitrogen pressure filtration
[0037] The dissolving liquid in the dissolving kettle 4 is sent to the filter press 5, and nitrogen is introduced to per...
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