Preparation method of bismuth subcarbonate

A bismuth carbonate, basic technology, applied in chemical instruments and methods, bismuth compounds, inorganic chemistry, etc., can solve the problems of acid and alkali resistance, limited heavy metal adsorption capacity, and unsatisfactory selective adsorption.

Active Publication Date: 2013-10-23
台山市新宁制药有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] However, some adsorption resin products in the prior art are not resistant to acid and alkali, and have limited adsorption capacity for heavy metals.
In particular, at high concentrations of interfering io

Method used

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  • Preparation method of bismuth subcarbonate
  • Preparation method of bismuth subcarbonate
  • Preparation method of bismuth subcarbonate

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0053] A) Preparation of polyacrylamide-co-styrene-co-acrylic acid copolymer (copolymer I, namely P(AM-St-AA))

[0054]83 g of monomeric acrylamide, 15 g of styrene and 2 g of acrylic acid were mixed to form 100 g of monomer mixture. Then add 20g of the above-mentioned monomer mixture in a glass reactor equipped with 500mL of deionized water, pass through nitrogen and carry out mechanical stirring, heat up to 55°C, add 0.5g of initiator potassium persulfate, and then proceed under stirring The polymerization was carried out for 1.5 hours to form a seed emulsion (ie, soap-free emulsion, self-emulsifying system). Then, the temperature of the seed emulsion is maintained at 55° C., the remaining 80 g of the monomer mixture is added dropwise to the seed emulsion and the time for adding is 3 hours, and the monomer mixture of 0.3 g will be formed while starting to drop the monomer mixture. The initiator solution formed by dissolving potassium sulfate in 5 ml of deionized water was s...

preparation Embodiment 2

[0060] The above example 1 was repeated, except that 0.2 g of crosslinking agent glutaraldehyde was added together with 20 g of formalin solution (35% concentration) in step B). A modified and slightly cross-linked polyacrylamide-co-styrene-co-acrylic acid copolymer (referred to as copolymer II-B) was obtained, and the weight average molecular weight measured by GPC method was 350,000. The content of mercapto (-SH) was determined to be 1.95wt% by purple spectrophotometry.

preparation Embodiment 3

[0062] Repeat the above Example 1, except that step B) does not add aminoethanethiol, and adds 8.5 g of dimethylamine. A modified polyacrylamide-co-styrene-co-acrylic acid copolymer (referred to as copolymer II-C) was obtained, and the weight average molecular weight measured by GPC method was about 130,000. The content of sulfhydryl (-SH) was determined to be 0wt% by purple spectrophotometry.

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Abstract

The method prepares bismuth subcarbonate from industrial sodium carbonate and industrial bismuth nitrate, and takes modified polyacrylamide-co-styrene-co-acrylic acid copolymer as the absorption material. Heavy metals are removed from the industrial sodium carbonate and industrial bismuth nitrate through absorption. The modified copolymer is prepared through modification of polyacrylamide-co-styrene-co-acrylic acid copolymer raw material with formaldehyde, dimethylamine and optionally selected C2-C4 organic amine containing sulfydryl, the specific reactions are that side chains of the copolymer are induced into hydroxymethyl (-CH2-OH) and aminomethyl (-CH2-N(CH3)2), and are optionally induced or not induced into sulfydryl (-SH) or sulfenyl (-S-). The modified copolymer has a relatively strong absorption ability of heavy metals such as lead, cadmium, mercury, and arsenic.

Description

technical field [0001] The invention relates to a preparation method of bismuth subcarbonate, in particular to a preparation method of high-purity bismuth subcarbonate. Background technique [0002] The molecular formula or structural formula of bismuth subcarbonate is (BiO) 2 CO 3 1 / 2H 2 O, molecular weight: 518.91, white or slightly yellowish powder; odorless, tasteless; slowly deteriorates when exposed to light. This product is insoluble in water and ethanol. Bismuth subcarbonate is used as a medicine to neutralize gastric acid and astringent, used for gastric and duodenal ulcers and diarrhea, etc., and also externally used for mild burns, ulcers and eczema. [0003] Chinese patent 103011286A discloses a process for producing bismuth subcarbonate with coarse bismuth oxide, including: ① Weigh the coarse bismuth oxide and sieve -60 mesh ≥ 95%, and grind the coarse particles on the sieve by grinding equipment such as a ball mill Then sieve and mix; ②Take the sieved crud...

Claims

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Application Information

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IPC IPC(8): C01G29/00B01J20/26C08F220/56C08F212/08C08F220/06C08F8/34C08F8/32C08F8/28C08F2/44C08K3/22
Inventor 不公告发明人
Owner 台山市新宁制药有限公司
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