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Method for preparing sodium sulfite by utilizing total alkali in hydrazine hydrate

A technology of sodium sulfite and hydrazine hydrate, applied in the field of hydrazine hydrate, can solve the problems of high added value of products, high cost, low energy consumption and the like, and achieve the effects of low price, low energy consumption and wide sources

Inactive Publication Date: 2011-08-31
福建省邵武市榕丰化工有限公司
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Problems solved by technology

[0008] The purpose of the present invention is to solve the defects of large energy consumption and high cost when extracting hydrazine hydrate by-products in the traditional process, and provide a method for producing sodium sulfite by using the total alkali in hydrazine hydrate, which has no waste discharge and low energy consumption in the whole production process , the generated product has high added value

Method used

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  • Method for preparing sodium sulfite by utilizing total alkali in hydrazine hydrate

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Embodiment 1

[0030] Inject 1200ml of hydrazine hydrate solution in a 2000ml three-necked flask, its concentration of hydrazine hydrate is 3.9%, and its total alkalinity is 12%.2 The gas undergoes an absorption reaction, and the end point of the reaction is pH 6.5. Under the condition of stirring, move the three-necked flask into an enamel basin filled with ice water, cool the temperature to 15-20°C for 1 hour, and precipitate Na 2 SO 3 ·7H 2 O 435 grams, filtrate 975ml, hydrazine hydrate concentration 5.3% in the filtrate.

Embodiment 2

[0032] Inject 1200ml of hydrazine hydrate solution into a 2000ml three-necked flask with a hydrazine hydrate concentration of 3.9% and a total alkalinity of 12%. Under stirring conditions, sodium metabisulfite products are gradually added for reaction. In the basin, cool the temperature to 15-20°C for 1 hour to precipitate Na 2 SO 3 ·7H 2 O 420 grams, filtrate 1015ml, hydrazine hydrate concentration 5.1% in the filtrate.

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Abstract

The invention provides a method for preparing sodium sulfite by utilizing total alkali in hydrazine hydrate, belonging to the technical field of hydrazine hydrate. The method comprises the following steps of: adding one or several kinds of raw materials of SO2 gas, NaHSO3 or Na2S2O5 to a hydrazine hydrate solution until the pH value of the hydrazine hydrate solution is 6.0-7.0, cooling and crystallizing the hydrazine hydrate solution, and then carrying out solid-liquid separation to obtain Na2SO3.7H2O. The invention overcomes the defects of high energy consumption, high cost and the like whenthe traditional process is used for extracting hydrazine hydrate byproducts and provides the method for preparing the sodium sulfite by utilizing total alkali in the hydrazine hydrate; the whole production process does not have three-waste discharge and has low energy consumption, and the produced products have high additional values.

Description

technical field [0001] The invention belongs to the technical field of hydrazine hydrate, and more specifically relates to a method for preparing sodium sulfite by utilizing total alkali in hydrazine hydrate. Background technique [0002] Hydrazine hydrate is an important fine chemical product, which mainly has various specifications of 35%, 40%, 80% and 100%. It is also used in the pharmaceutical industry, such as for the synthesis of isoniazid and fenacillin; it can also be used for the production of insecticides and fungicides, such as paclobutrazol, yercao powder and other pesticides. In addition, the strong reducibility of hydrazine hydrate can be used as oxygen scavenger for boiler water, rocket propellant, etc. The traditional production process of hydrazine hydrate (referred to as urea method) is divided into two steps: [0003] (1) Preparation of sodium hypochlorite: below 35°C, sodium hypochlorite is generated by the reaction of caustic soda and chlorine gas [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D5/14
Inventor 黄绳炀夏霆陈世豪邹福旺张明坤黄兵陈鼎东吴元金
Owner 福建省邵武市榕丰化工有限公司
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