Improvement of production method of activating and modifying sodium bisulfoxylate formaldehyde

A technology of sodium formaldehyde sulfoxylate and production method, applied in chemical instruments and methods, sulfur compounds, inorganic chemistry and other directions, can solve problems such as poor stability and decreased activity, and achieve improved stability, simplified process and guaranteed purity. Effect

Inactive Publication Date: 2004-12-29
吉林市大宇化工有限公司
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AI Technical Summary

Problems solved by technology

However, this product is easy to absorb water or oxidize, and has poor stability. It must be used within 24 hours after opening the packaging barrel, otherwise the activity will decrease, and the sealed storage should not exceed half a year.

Method used

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  • Improvement of production method of activating and modifying sodium bisulfoxylate formaldehyde

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Embodiment Construction

[0019] With reference to the drawings and specific implementation methods, the present invention is further described as follows:

[0020] See Figure 2 After 110kg of zinc powder and 500kg of deionized water are made into a slurry, it is pumped into the 1# reactor, the circulation pump is started, and SO is introduced into the reactor 2 For gas, use cooling water to control the temperature to 55±5℃, and stop entering SO when the material turns yellow 2 Analyze the zinc disulfite content ≥400g / L to obtain qualified ZnS 2 O 4 .

[0021] Add 165kg of formaldehyde solution (content 37%) to the 2# reactor, and then add the ZnS in the above 1# reactor 2 O 4 Add it to the reactor, heat with steam, start stirring and control the temperature to 100±5℃, and add zinc powder in batches. The amount is 0.82 times the original amount of zinc powder mentioned above. Add 2kg per batch until the addition After the heating is stopped, when the temperature reaches 70°C, the material is sent to the se...

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Abstract

The improved production process of formaldehyde sodium sulfoxylate activator includes making slurry with zinc powder and deionized water in the weight ratio of 1 to 4.545; pumping the slurry into the first reactor and introducing SO2 gas at 55 deg.c until the material becomes yellow; adding formaldehyde in 1.65 times the initial zinc powder weight into the second reactor, adding the material from the first reactor, heating to 100 deg.c while stirring, adding zinc powder of 0.82 time the initial amount, lowering the temperature to 70 deg.c, said vacuum dewatering to water content of not more than 20 %; adding deionized water in the amount of 1.3 times the initial water weight to the third reactor, adding the dewatered material, heating to 70 deg.c under stirring, adding EAC stabilizer in the amount of 1 % of zinc powder weight slowly, adding NaOH after 10 min to pH 11, filtering and collecting product.

Description

Technical field [0001] The invention relates to a production method of sodium formaldehyde sulfoxylate, in particular to the improvement of a modified production method of the product. Background technique [0002] Sodium formaldehyde sulfoxylate (NaHSO 2 ·CH 2 O·2H 2 O), its appearance is white block or crystalline powder, commonly known as carved white block or carved white powder. The existing production methods are mainly: [0003] Zinc Dithionite (ZnS 2 O 4 ), the synthesis of basic zinc formaldehyde hydrogen sulfoxylate [Zn(OH)HSO 2 ·CH 2 O] synthesis and dehydration, sodium formaldehyde sulfoxylate (NaHSO 2 ·CH 2 O·2H 2 O) Synthesis and post-treatment to obtain a solid product, namely the so-called carved white block or white powder. [0004] The solid sodium formaldehyde sulfoxylate obtained above is soluble in water, stable at room temperature, and decomposed into sulfite at higher temperature. This product has a strong reducing effect. It can be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/98C07C47/02
Inventor 孙长明
Owner 吉林市大宇化工有限公司
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