Preparation method of tetrakis hydroxymetyl phosphonium sulfuric-urea polymer
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A technology of tetrakis hydroxymethyl phosphorus sulfate and initial shrinkage, which is applied in chemical instruments and methods, compounds of group 5/15 elements of the periodic table, textiles and papermaking, etc., which can solve the problems of slow reaction speed and achieve non-tearing The effect of breaking, reducing impurity content and enhancing toughness
Inactive Publication Date: 2009-10-21
JIANGSU DANAI CHEM
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[0005] (3), the temperature of 40℃~50℃ is too low, and the reaction speed is slow
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Embodiment 1
[0017] 1. After the phosphine gas is washed in the inlet water washing tank, it is collected into the storage tank, and then washed into the circulation tower through the outlet gas washing tank.
[0018] 2. Add 300 kg of ion-free water to the batching kettle, and suck in sulfuric acid while stirring, and suck in formaldehyde after cooling in the kettle (according to the molar ratio of formaldehyde and sulfuric acid 8.5:1).
[0019] 3. Pour the feed liquid into the circulating kettle. When the temperature is ≥40°C, open the air valve and circulation pump, and gradually heat the jacket to 55°C to close the air valve. The feed liquid absorbs phosphine gas and the main content is 40% through laboratory tests. , discharge into the storage tank.
[0020] 4. When there are two tanks for the circulating feed liquid, pump it into the concentration tank. When the vacuum is at 0.06Mpa, the jacket is heated. When the concentrated content test tetrakis hydroxymethyl phosphorus sulfate con...
Embodiment 2
[0024] 1. After the phosphine gas is washed in the inlet water washing tank, it is collected into the storage tank, and then washed into the circulation tower through the outlet gas washing tank.
[0025] 2. Add 300 kg of ion-free water to the batching kettle, and suck in sulfuric acid while stirring, and suck in formaldehyde after cooling in the kettle (according to the molar ratio of formaldehyde and sulfuric acid 8.7:1).
[0026] 3. Pour the feed liquid into the circulating kettle. When the temperature is ≥40°C, open the air valve and circulation pump, gradually heat the jacket to 55°C and close the air valve. The feed liquid absorbs phosphine gas and the main content is 40% through laboratory tests. , discharge into the storage tank.
[0027] 4. When there are two tanks for the circulating feed liquid, pump it into the concentration tank. When the vacuum is at 0.06Mpa, the jacket is heated. When the concentrated content test tetrakis hydroxymethyl phosphorus sulfate conten...
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Abstract
The invention relates to a preparation method of tetrakis hydroxymetyl phosphonium sulfuric-urea polymer. The technique process comprises the following steps: phosphine gas is collected and stored after being bathed in an intake washing kettle; deionized water is added into a dosage kettle, then sulphuric acid and formaldehyde is pumped into the dosage kettle to be stirred according to the mol ratio of 1:8.5-8.7; the above mixed liquid is driven into a recycling kettle in which phosphine gas is absorbed by a recycling tower; the feed liquor is pumped into a decoloring kettle, then 2 per mill of active carbon power is added; the feed liquor and urea is pumped into the dosage kettle to be stirred according to the mol ratio of 1.25:1, sodium hudroxide is used for adjusting PH value; tetrakis hydroxymetyl phosphonium sulfuric-urea polymer is obtained through fiber filter bag with aperture being 2um. The method has the advantages that sulphuric acid and formaldehyde is mixed according to the ratio so that sulphuric acid and formaldehyde can fully react while absorbing phosphine gas, and the feed liquor and the urea is mixed according to the mol ratio of 1.25:1 so as to ensure the primary content of tetrakis hydroxymetyl phosphonium sulfuric. The product is enhanced in tenacity and is unlikely to be torn. The fabric has good fire resistance and washing resistance without affecting various initial excellent performances of the fabric. The method has no environmental pollution and can realize zero emission of toxic gas.
Description
technical field [0001] The preparation method of tetrakis hydroxymethyl phosphorus sulfate-urea initial shrink body that the present invention relates to, it is with the phosphine gas that produces when producing sodium hypophosphite, adds formaldehyde, sulfuric acid, deionized water and makes tetrakis hydroxymethyl phosphorus sulfate Finally, caustic soda and urea are added through chemical reaction and physical adsorption. The invention belongs to the technical field of preparation of tetrakis hydroxymethyl phosphorus sulfate-urea initial contraction body. Background technique [0002] The existing preparation method is to collect and store phosphine from the waste gas produced in the production process of sodium hypophosphite; formaldehyde and sulfuric acid are made into an aqueous solution with a molar ratio of 8.05 to 8.10:1; Put it into the absorption tower, spray it downward from the top of the tower, send the phosphine gas in the gas tank into the absorption tower w...
Claims
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