Method for coproduction of high purity aminic acid and acid sodium phosphate by reaction of calcium formate and peroxyphosphoric acid

Abstract

The invention relates to a method for coproducing high-purity methanoic acid and monobasic sodium phosphate by reaction of calcium formate and ultraphosphate. The method comprises the following steps that: carbon monoxide enters a reaction tower III; calcium hydroxide enters a reaction tower I to perform a counterflow reaction with carbon monoxide from a reaction tower II, a reaction solution overflows to the reaction tower II to perform the counterflow reaction with the carbon monoxide from the reaction tower III, the reaction solution enters the reaction tower III to perform the couterflow reaction with the carbon monoxide, the reaction solution overflows into a discharge tank from the reaction tower III to prepare a calcium formate preparation solution; the calcium formate preparation solution enters a reaction kettle, methanoic acid is dripped into the reaction kettle, sulfureted hydrogen is introduced into the reaction kettle, the mixture is separated and filtered through a filter I, a filtrate enters a continuous crystallizer, a crystalline liquid enters a filter II, and the filtered calcium formate is prepared into a finished product calcium formate through a drier; ultraphosphate, the methanoic acid and the calcium formate are conveyed into a horizontal double screw reactor to generate the methanoic acid and monobasic calcium phosphate; the methanoic acid and the monobasic calcium phosphate enter a methanoic acid distilling still for reduced pressure distillation; and the monobasic calcium phosphate is delivered to a monobasic calcium phosphate measurement receiving tank, while the monobasic acid enters a methanoic acid receiving tank. The method has high yield of the methanoic acid and low manufacturing cost.

Description

(1) Technical field [0001] The invention relates to a method for jointly producing high-purity formic acid and sodium dihydrogen phosphate by reacting calcium formate and superphosphoric acid. It belongs to the technical field of inorganic chemistry. (2) Background technology [0002] There are five main production methods of industrial formic acid: [0003] 1. Sodium formate method [0004] Carbon monoxide and sodium hydrogen hydride react at 160-200°C and 1.4-1.6Mpa to form sodium formate. The reactor is composed of a group of multi-stage reactors. [0005] Treat the same amount of 85%-90% formic acid and sodium formate slurry with dilute sulfuric acid to obtain 76% formic acid water azeotrope, and obtain 85%-90% formic acid after distillation. Formic acid yield is only about 70%. [0006] 2. Carboxylation reaction of methanol and carbon monoxide with sodium methoxide as a catalyst at 80°C and 4.5Mpa to generate methyl formate. Methyl formate reacts with ammonia at 6...

AI Technical Summary

Problems solved by technology

After adopting the joint production process of sodium formate and superphosphoric acid, because 2.3 tons of sodium dihydrogen phosphate are recovered per ton of formic acid, the production cost of this method is relatively high

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