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Method for producing rongalite with low zinc

A production method and a technology for carving white blocks, which are applied in chemical instruments and methods, alkali metal sulfites/sulfites, inorganic chemistry, etc., can solve problems such as the inability to meet sodium bisulfite formaldehyde, etc., and achieve improved economic benefits and efficiency. Social benefits, low manufacturing cost, good stability

Inactive Publication Date: 2007-12-26
JIANGSU DONGTAI FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The zinc content of this sodium bisulfite formaldehyde is about 300-500PPm, which cannot meet the requirements of certain industries such as medicine, rubber and plastics for sodium bisulfite formaldehyde with lower requirements for zinc content.

Method used

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  • Method for producing rongalite with low zinc

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The component ratio of the low-zinc carved white block of the present invention is by weight percentage:

[0023] The production method of the low-zinc carved white block of the present invention adopts the following process steps:

[0024] 1. First put 30% water and 7% zinc powder on 1.6m 3 In the beating barrel, mix and beat at room temperature, and then put it into the 6m 3 In the barrel reactor, 13% sulfur dioxide gas is added, and the reaction is carried out at a temperature of 30° C. to form zinc dithionite. The reaction time is 120 minutes; the pressure is normal pressure.

[0025] 2. Put zinc dithionite into 10m 3 Add 14% formaldehyde and 5% zinc powder into the two-three reaction pot, and react at 95°C to form basic zinc formaldehyde sulfoxylate, reaction time: 75 minutes; pressure: normal pressure.

[0026] 3. Put 10m 3 The basic zinc hydrogen sulfoxylate formaldehyde in the two or three reaction pots is precipitated, the supernatant is removed, and 22% so...

Embodiment 2

[0034] The component ratio of the low-zinc carved white block of the present invention is by weight percentage:

[0035] The production method of the low-zinc carved white block of the present invention adopts the following process steps:

[0036] 1. Put 32% water and 6.5% zinc powder on 1.6m 3 In the beating barrel, mix and beat at room temperature, and then put it into the 6m 3 In the barrel reactor, 12.5% ​​sulfur dioxide gas is added, and the reaction is carried out at a temperature of 40° C. to form zinc dithionite. The reaction time is 110 minutes; the pressure is normal pressure.

[0037] 2. Put zinc dithionite into 10m 3 Add 15% formaldehyde and 5.5% zinc powder into the two-three reaction pot, and react at 100°C to form basic zinc formaldehyde sulfoxylate, reaction time: 68 minutes; pressure: normal pressure.

[0038] 3. Put 10m 3 The basic zinc hydrogen sulfoxylate formaldehyde in the two or three reaction pots is precipitated, the supernatant is removed, and 21%...

Embodiment 3

[0046] The component ratio of the low-zinc carved white block of the present invention is by weight percentage:

[0047] The production method of the low-zinc carved white block of the present invention adopts the following process steps:

[0048] 1. First put 34% water and 6% zinc powder on 1.6m 3 In the beating barrel, mix and beat at room temperature, and then put it into the 6m 3 In the barrel reactor, add 12% sulfur dioxide gas, and react to zinc dithionite at a temperature of 50° C., reaction time: 100 minutes; pressure: normal pressure.

[0049] 2. Put zinc dithionite into 10m 3Add 16% formaldehyde and 5% zinc powder into the two-three reaction pot, and react at 105°C to form basic zinc formaldehyde sulfoxylate, reaction time: 60 minutes; pressure: normal pressure.

[0050] 3. Put 10m 3 The basic zinc hydrogen sulfoxylate formaldehyde in the two or three reaction pots is precipitated, the supernatant is removed, and 20% sodium hydroxide is added to react again, and ...

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Abstract

This invention relates to a method for producing low-zinc rongalite. The method comprises: mixing water and zinc powder, beating, adding SO2, reacting to obtain zinc hydrosulfite, placing in a reaction pot, adding formaldehyde and zinc powder, reacting to obtain alkaline sodium formaldehyde sulfoxylate, precipitating, removing the supernatant, adding NaOH, reacting to obtain sodium formaldehyde sulfoxylate, filtering, standing for settlement, cooling, adjusting the pH value, performing ultrafiltration, mixing, adding NaOH, sending into an evaporator, evaporating to obtain melt of low-zinc sodium formaldehyde sulfoxylate, cooling, solidifying, and pulverizing to obtain the final product. The obtained low-zinc rongalite can satisfy the requirements of pharmaceutical and plastic industries. The zinc content is less than or equal to 50 ppm. The low-zinc rongalite has such advantages as high purity, high stability, low production cost and convenient usage.

Description

technical field [0001] The invention relates to a method for producing low-zinc diabolites, belonging to the technical field of chemical industry. Background technique [0002] Diaobaiku (sodium hydrogen sulfoxylate formaldehyde) is an important chemical raw material, which is widely used in synthetic rubber, printing and dyeing industries. At present, the preparation of sodium bisulfite formaldehyde (diamond block) is generally prepared by zinc powder-sulfur dioxide-formaldehyde method. It is made of zinc powder and water into a suspension, and sulfur dioxide gas is introduced to generate zinc dithionite. , adding zinc dithionite solution into formaldehyde solution to react, then adding zinc powder to generate basic zinc hydrogen sulfoxylate formaldehyde suspension, then adding sodium hydroxide solution to generate sodium hydrogen sulfoxylate formaldehyde solution, and then vacuum concentrating to obtain hyposulfuric acid Sodium hydrogen formaldehyde (Diaobai block) finish...

Claims

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Application Information

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IPC IPC(8): C07F1/04C01D5/00C01D13/00
Inventor 杨运顾建伟谢心元冯军唐继峰
Owner JIANGSU DONGTAI FINE CHEM
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