Sodium hydrosulfite composition and preparation method thereof

A technology of composition and sodium hydrosulfite, which is applied in dyeing, textiles and papermaking, etc. It can solve the problems of high pollution content in sewage, cumbersome recycling, and reduced reduction ability, and achieves obvious coating effect, low material cost, and enhanced stability sexual effect

Active Publication Date: 2012-06-13
ZHEJIANG JIACHENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The hydrosulfite prepared by this method also has the following disadvantages: 1. unstable, easy to generate heat when exposed to moisture, easy to decompose, and decomposes faster after being dissolved in water, resulting in a reduction in reducing ability; 2. The decomposition speed is fast during use, and in actual use, In order to have the required reducing power in the dye bath, the amount of sodium hydrosulfite greatly exceeds the theoretical amount
3. The sewage discharged after use ha

Method used

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preparation example Construction

[0037] The present invention also provides a kind of preparation method of hydrosulfite composition, and this method comprises the following steps:

[0038] (1) After filtering the sodium dithionite after alcohol analysis, add an inorganic salt coating agent, fully mix;

[0039] (2) uniformly spray the organic solvent solution of the polymer coating agent on the mixture obtained in the above step (1), and then dry;

[0040] All the above steps were carried out under the protection of nitrogen.

[0041] According to the method provided by the present invention, the concentration of sodium dithionite in the sodium dithionite after alcohol analysis is preferably 85-90% by weight, so as to ensure the coating effect of the inorganic salt coating agent and the polymer coating agent.

[0042] According to the method provided by the present invention, in the organic solvent solution of the polymer coating agent, the concentration of the polymer coating agent is not limited, as long a...

Embodiment 1

[0055] The sodium dithionite (average particle diameter is 400 μm) that is 85% by weight after the concentration of the dried 900kg alcohol analysis is dropped into the mixing pot, starts to stir, and drops into 4.5kg pulverized as the inorganic coating agent, the average particle diameter is 150 μm The sodium sulfate of sodium sulfate and 0.9kg pulverized, the sodium chloride that the average particle diameter is 150 μ m, mix homogeneously; Then the methanol solution (0.8kg Polyethylene glycol and 0.2kg methanol) are uniformly sprayed (atomized) on the homogeneously mixed mixture, after blending uniformly, dried at 60° C. to obtain a hydrosulfite composition with an average particle diameter of 1 mm.

Embodiment 2

[0057] 850kg of dry 850kg alcohol analysis after the concentration is 90% by weight of sodium dithionite (average particle diameter is 400 μm) into the blending pot, start stirring, drop into 0.1kg of crushed good as stabilizer, the average particle diameter is 500 μm Magnesium chloride, mix uniformly; Add 100kg of crushed sodium bicarbonate with an average particle diameter of 400 μm as a granulating agent, mix uniformly; Add 4.07 kg of crushed inorganic salt coating agent with an average particle diameter of 150 μm Sodium sulfate and 0.81 kg of crushed sodium chloride with an average particle size of 150 μm are mixed evenly; then 0.1 kg of sodium silicate with an average particle size of 50 μm is added as an anti-friction agent, mixed evenly, and then sprayed The methanol solution (0.8kg polyvinyl alcohol and 0.2kg methyl alcohol) of polyvinyl alcohol as the weight-average molecular weight of polymer coating agent is 8000 and is evenly sprayed (atomized) on the mixture that h...

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Abstract

The invention provides a sodium hydrosulfite composition and a preparation method thereof. The sodium hydrosulfite composition contains the following steps of: sodium hydrosulfite, an inorganic salt coating agent and a polymer coating agent, wherein the inorganic salt coating agent contains sulfate and hydrochloride; the polymer coating agent is selected from one or more of polyethylene glycol, poval, polyacrylate and a maleic acid-acrylic acid copolymer. Compared with the conventional sodium hydrosulfite composition, the sodium hydrosulfite composition has the advantages of safety and stability in transportation and storage, slow and sustained release in the using process and low using amount during use.

Description

technical field [0001] The invention relates to a hydrosulfite composition, and also relates to a preparation method of the hydrosulfite composition. Background technique [0002] Sodium hydrosulfite (sodium dithionite) has good reducibility in aqueous solution, so it is widely used as a reducing agent for printing and dyeing, a bleaching agent for fabrics and pulp, and a raw material for food processing and pharmaceutical industries. At present, the sodium hydrosulfite produced is very easy to absorb moisture in the air and decompose naturally during storage, releasing a large amount of heat, causing combustion and fire. [0003] Mention in U.S. Patent USP3054658 and Japanese Patent Publication Clear 59-3008, add the method for sodium benzoate in sodium benzoate to manufacture stable sodium benzoate, but the sodium sulfite that these methods make is not stable enough, simultaneously, consumes more More expensive sodium benzoate increases the cost of hydrosulfite. [0004]...

Claims

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Application Information

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IPC IPC(8): D06P5/10D06P5/08
Inventor 方标景雪苹靡永祥陈素娟
Owner ZHEJIANG JIACHENG CHEM
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