CN101905889A - Hot-blast air drying method for preparing borax pentahydrate - Google Patents
Hot-blast air drying method for preparing borax pentahydrate Download PDFInfo
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- CN101905889A CN101905889A CN 201010267041 CN201010267041A CN101905889A CN 101905889 A CN101905889 A CN 101905889A CN 201010267041 CN201010267041 CN 201010267041 CN 201010267041 A CN201010267041 A CN 201010267041A CN 101905889 A CN101905889 A CN 101905889A
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Abstract
The invention relates to a hot-blast air drying method for preparing borax pentahydrate, comprising the following steps of: putting raw material borax decahydrate into a conventional hot-blast air drying reactor, wherein the height of a raw material layer is 20mm-1000mm; and enabling constant-temperature hot-blast air with the temperature of 30-40 DEG C to enter into the reactor from the bottom of the reactor and naturally overflow, wherein the reaction temperature is 8-0.5h. Compared with the prior art, the invention has the biggest advantage of adopting the available borax decahydrate as the raw material and having simple preparation method, convenient operation, high finished product quality and wide application range.
Description
Technical field
The present invention relates to a kind of preparation method of BORAX PENTAHYDRATE-99.9 MIN, relate in particular to a kind of method of hot-blast air drying method for preparing borax pentahydrate.
Background technology
BORAX PENTAHYDRATE-99.9 MIN is important basic Inorganic Chemicals, and its Application Areas is extensive.Be mainly used in manufacturing special glass, in mining, metallurgy, be used as antifreezing agent and antithrombotics in addition, also be used as the additive of electroplate liquid, the solubility promoter of non-ferrous metal and special alloy.Mentioned in the patent 200910058886.4 " method of enriching borax pentahydrate from low-grade deposits of salt lake " with salt lake sediment and having processed through multistep, the yield that makes BORAX PENTAHYDRATE-99.9 MIN is greater than 80%.But this method is because its places of origin of raw materials is single, and operation makes it can not obtain large-area widespread use than reasons such as length.Other has patent 200910073882.3 " making method of four water eight borate two sodium ", proposes especially in this patent to use BORAX PENTAHYDRATE-99.9 MIN to make raw material as it.But since BORAX PENTAHYDRATE-99.9 MIN itself be difficult for obtain, make subsequent product extensively not make.Present BORAX PENTAHYDRATE-99.9 MIN preparation method commonly used has only a kind of, and be: borax decahydrate is dissolved in 80-100 ℃ water, and ratio is about 2: 1, between 80 ℃-90 ℃, carry out underpressure distillation, cooling makes it crystallization again, is filtering more than 58 ℃, gets the BORAX PENTAHYDRATE-99.9 MIN finished product after the oven dry.But the shortcoming of this method is: energy consumption height, complex process.
Summary of the invention
For overcoming the shortcoming of prior art, the invention provides a kind of making method that five crystal water obtain BORAX PENTAHYDRATE-99.9 MIN of from borax decahydrate, sloughing.
The present invention adopts following technical scheme:
Hot-blast air drying method for preparing borax pentahydrate, it is characterized in that: the raw material borax decahydrate is dropped in the conventional hot-air seasoning reactor, the raw material layer height is 20mm-1000mm, making temperature is that 30 ℃～400 ℃ constant temperature hot blast enters into reactor and overflowing naturally from reactor bottom, reaction times 8-0.5h, remaining solid in the reactor is taken out, be BORAX PENTAHYDRATE-99.9 MIN.
At first fusion after the borax decahydrate heating, expanding then loses crystal water.Because of the constructional feature of borax decahydrate, wherein five crystal water are being difficult to lose below 400 ℃, become Borax pentahydrate just losing crystal water more than 400 ℃ fully, and therefore product of the present invention is a BORAX PENTAHYDRATE-99.9 MIN, and can not be for containing the borax of other quantity crystal water.
Than prior art, biggest advantage of the present invention is that to adopt the borax decahydrate of more easily obtaining be raw material, and the preparation method is simple, and easy to operate, energy consumption is low, and quality of finished is good, has wide range of applications.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
The method of calculation of BORAX PENTAHYDRATE-99.9 MIN content:
The molecular weight of BORAX PENTAHYDRATE-99.9 MIN is 292g/mol, and the BORAX PENTAHYDRATE-99.9 MIN actual molecular weight after testing of the present invention's preparation is M, and then the content of BORAX PENTAHYDRATE-99.9 MIN is calculated as follows:
Embodiment 1
Get borax decahydrate 100 mass parts, raw material layer height 50mm drops in the reactor, and reactor heating makes 70 ℃ hot blast enter into reactor from the reactor bottom, through behind the 8H, takes out whole remaining solids, is about the BORAX PENTAHYDRATE-99.9 MIN of 75 mass parts.
Get the remaining solid of certain mass, the dissolving constant volume, with weak acid reinforcement (the hydrolysate boric acid that promptly utilizes borax with the N.F,USP MANNITOL reaction time generate the stronger complex acid of acidity) detection, its molecular weight is 290g/mol, BORAX PENTAHYDRATE-99.9 MIN content is 100.7%.
Embodiment 2
Get borax decahydrate 200 mass parts, raw material layer height 100mm drops in the reactor, and reactor heating makes 130 ℃ hot blast enter into reactor from reactor bottom, through behind the 6H, takes out whole remaining solids, is about the BORAX PENTAHYDRATE-99.9 MIN of 150 mass parts.
Molecular weight is 286g/mol after testing, and BORAX PENTAHYDRATE-99.9 MIN content is 102.1%.
Embodiment 3
Get borax decahydrate 200 mass parts, raw material layer height 250mm drops in the reactor, and reactor heating makes 180 ℃ hot blast enter into reactor from the reactor bottom, through behind the 3H, takes out whole remaining solids, is about the BORAX PENTAHYDRATE-99.9 MIN of 150 mass parts.
Molecular weight is 284g/mol after testing, BORAX PENTAHYDRATE-99.9 MIN content 102.8%.
Embodiment 4
Get borax decahydrate 300 mass parts, raw material layer height 400mm drops in the reactor, and reactor heating makes 250 ℃ hot blast enter into reactor from the reactor bottom, through behind the 2H, takes out whole remaining solids, is the BORAX PENTAHYDRATE-99.9 MIN of 223 mass parts.
Molecular weight is 284g/mol after testing, BORAX PENTAHYDRATE-99.9 MIN content 102.8%.
Embodiment 5
Get borax decahydrate 400 mass parts, raw material layer height 500mm drops in the reactor, and reactor heating makes 400 ℃ hot blast enter into reactor from reactor bottom, through behind the 0.5H, takes out whole remaining solids, is the BORAX PENTAHYDRATE-99.9 MIN of 304 mass parts.
Molecular weight is 282g/mol after testing, and BORAX PENTAHYDRATE-99.9 MIN content is 103.5%.
Claims (1)
1. hot-blast air drying method for preparing borax pentahydrate, it is characterized in that: the raw material borax decahydrate is dropped in the conventional hot-air seasoning reactor, the raw material layer height is 20mm-1000mm, making temperature is that 30 ℃～400 ℃ hot blast enters into reactor and overflow reaction times 8-0.5h naturally from reactor bottom.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010267041 CN101905889A (en) | 2010-08-26 | 2010-08-26 | Hot-blast air drying method for preparing borax pentahydrate |
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| CN 201010267041 CN101905889A (en) | 2010-08-26 | 2010-08-26 | Hot-blast air drying method for preparing borax pentahydrate |
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| CN101905889A true CN101905889A (en) | 2010-12-08 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101597068A (en) * | 2009-04-09 | 2009-12-09 | 严笳化 | The method of enriching borax pentahydrate from low-grade deposits of salt lake |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101597068A (en) * | 2009-04-09 | 2009-12-09 | 严笳化 | The method of enriching borax pentahydrate from low-grade deposits of salt lake |
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Open date: 20101208 |