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A kind of production technology of nanoscale calcium sulfate hemihydrate

A calcium sulfate hemihydrate, production process technology, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems of additives that are not easy to clean, affect product quality, additive residues, etc., achieve high equipment utilization, low cost, and production short cycle effect

Active Publication Date: 2021-09-07
CHEM TECH ACAD OF SHANDONG PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current method of preparing nano-scale calcium sulfate hemihydrate is to prevent tiny calcium sulfate molecules from aggregating to achieve nano-scale effects by adding additives such as coupling agents, surfactants, and anti-stripping agents to the reaction solution. It needs to be separated many times and washed with a large amount of water to remove the various additives added. This method uses a large amount of water to wash the calcium sulfate product, resulting in a large amount of waste of water resources, and the added additives are not easy to clean, and it is easy to cause additive residues. affect product quality
[0004] To sum up, the current preparation method of nano-scale calcium sulfate hemihydrate consumes a lot of water during the preparation process and will introduce more impurities into the reaction system. Further consideration of the purification process will be required in the later stage, resulting in high product energy consumption and high yield. Low, poor economic benefits and other issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A kind of production technology of nanoscale calcium sulfate hemihydrate, concrete steps are as follows:

[0032] 1) Add calcium oxide to the reaction device, and add formic acid with a concentration of 50% to the aforementioned device, set the temperature at 60°C, keep the temperature for 1 hour, and finish the reaction until the pH of the mixture is 7, filter the reactant, remove the filter residue, and leave The filtrate is calcium solution;

[0033] 2) After heating the calcium solution obtained in step 1) to 80°C, start adding sodium sulfate solution dropwise, start ultrasonic treatment 1 min after adding sodium sulfate solution, and stop ultrasonic treatment until the sodium sulfate solution is added dropwise for 3 hours. , to obtain calcium sulfate suspension;

[0034] 3) The calcium sulfate suspension obtained in step 2) is transferred to a spray drying device within 30 minutes after the ultrasound is finished, and spray-dried to make a finished product.

[00...

Embodiment 2

[0044] A kind of production technology of nanoscale calcium sulfate hemihydrate, concrete steps are as follows:

[0045] 1) Add calcium oxide to the reaction device, and add formic acid with a concentration of 70% to the aforementioned device, set the temperature at 70-80°C, keep the temperature for 2 hours, and finish the reaction until the pH of the mixture is 8, filter the reactant, remove filter residue, leaving the filtrate is the calcium solution;

[0046] 2) After heating the calcium solution obtained in step 1) to 80-90°C, start to add sodium sulfate solution dropwise, and start ultrasonic treatment 1-3 minutes after the sodium sulfate solution is added dropwise, until the sodium sulfate solution is added dropwise and ultrasonically 2 Hours, stop the ultrasound, get calcium sulfate suspension;

[0047] 3) The calcium sulfate suspension obtained in step 2) is transferred to a spray drying device within 20 minutes after the ultrasound is finished, and spray-dried to mak...

Embodiment 3

[0056] A kind of production technology of nanoscale calcium sulfate hemihydrate, concrete steps are as follows:

[0057] 1) Add calcium oxide to the reaction device, and add acetic acid with a concentration of 60% to the aforementioned device, set the temperature at 60-70°C, keep the temperature for 1-2 hours, and finish the reaction until the pH of the mixture is 7-8. Filtrate the product, remove the filter residue, and leave the filtrate as the calcium solution;

[0058] 2) After heating the calcium solution obtained in step 1) to 80-90°C, start adding sodium sulfate solution dropwise, and start ultrasonic treatment 1-3 minutes after adding sodium sulfate solution, until the sodium sulfate solution is added dropwise and ultrasonically 4 Hours, stop the ultrasound, get calcium sulfate suspension;

[0059] 3) The calcium sulfate suspension obtained in step 2) is transferred to a spray drying device within 35 minutes after the ultrasound is finished, and spray-dried to make a ...

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Abstract

The invention discloses a synthesis method of nano-scale calcium sulfate hemihydrate: acidifying calcium oxide, adding sodium sulfate solution under ultrasonic conditions to form nano-scale calcium sulfate solution, and then removing water and impurities in the reaction solution through high-temperature spray drying , to obtain nano-scale calcium sulfate hemihydrate powder. The present invention solves the problem that the current preparation method for preparing nano-scale calcium sulfate hemihydrate consumes a lot of water during the preparation process and introduces more impurities into the reaction system. The purification process needs to be further considered in the later stage, resulting in high product energy consumption and high yield. Low energy consumption, poor economic benefits and other issues provide a production process with low energy consumption, less waste water, high economic benefits, and green and environmental protection.

Description

technical field [0001] The invention relates to the field of chemical production, in particular to a production process of nanoscale calcium sulfate hemihydrate. Background technique [0002] Nano-scale calcium sulfate hemihydrate is widely used in the synthesis of medicine, food additives, high-tech biomaterials HA, feed additive VC phosphate synthesis, calcium synthesis and calcium naphthenate, calcium lactate, calcium citrate, beer Process, sugar industry additives and water treatment and other high-end organic chemical synthesis. [0003] At present, the method of preparing nano-scale calcium sulfate hemihydrate is to prevent the polymerization of tiny calcium sulfate molecules by adding additives such as coupling agents, surfactants, and anti-stripping agents to the reaction solution to achieve nano-scale effects. It needs to be separated many times and washed with a large amount of water to remove the various additives added. This method uses a large amount of water t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/46
CPCC01F11/46C01P2004/62
Inventor 刘启奎岳涛张智慧王灏高维丹冯维春
Owner CHEM TECH ACAD OF SHANDONG PROVINCE
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