Preparation method for super-grade pure hydrazine sulfate

Abstract

The invention provides a kind of preparation method of high-grade pure hydrazine sulfate, and concrete preparation steps are as follows: (1) add pure water in glass-lined reactor, stir, slowly add 98% sulfuric acid under cooling, add, at 70- Add 80% hydrazine hydrate at 80°C and filter while hot, wherein the mass ratio of pure water, 98% sulfuric acid and 80% hydrazine hydrate is 10:10:4; (2) use sulfuric acid or hydrazine hydrate to adjust the pH of the filtrate to 4- 5. Stir for 20-60 minutes, wait for no change in pH, cool and crystallize to 25°C, centrifuge to separate the crystals, wash with absolute ethanol, and air-dry at room temperature to obtain the finished product; the preparation method is simple in process, and has developed a The preparation method of the chemical reagent hydrazine sulfate, the product quality reaches the high-grade pure standard, and is suitable for the needs of large-scale industrial production.

Description

technical field

[0001] The present invention relates to a kind of preparation method of chemical reagent, especially a kind of preparation method of high grade pure hydrazine sulfate. Background technique

[0002] Hydrazine sulfate is a salt of hydrazine and sulfuric acid, molecular formula N 2 h 4 ·H 2 SO 4 . It is colorless and odorless squamous crystal or orthorhombic crystal. Slightly soluble in cold water, easily soluble in hot water, the aqueous solution is acidic. Insoluble in alcohol. It is a specific reagent for the gravimetric determination of nickel, cobalt and cadmium. It is also used to determine chlorate, hypochlorous acid, carbonyl compounds, arsenic and hydroxyl, purify rare metals, and separate polonium from tellurium. It can be used as a reducing agent or in organic synthesis. Preparation of turbidity solutions of thymol in liver function tests.

[0003] The preparation of hydrazine sulfate, the urea method is commonly used in industry, reacts ure...

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