Device and method for recovering crude ethylene glycol in polyester production process
A production process, ethylene glycol technology, applied in separation methods, chemical instruments and methods, preparation of organic compounds, etc., can solve problems such as low stability, achieve simple steps, increase retention rate, and prolong operation time
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Embodiment 1
[0034] Crude ethylene glycol recovered during the polyester production process is treated using the aforementioned device. The polyester is a copolymer of terephthalic acid, ethylene glycol and caprolactam, the mass composition of the crude glycol logistics extracted from the polyester vacuum system has a certain degree of fluctuation, the present embodiment takes one set of typical data as an example to elaborate (in terms of mass fraction): 80% glycol, 8.5% water, caprolactam 5%, acetaldehyde 0.6%, 2-methyl-1,3- Dioxolane 0.4%, N-ethylmorpholine 0.2%, morpholine ethanol 0.2%, cyclopentanone 0.8%, aminocarboxaldehyde 0.3%, succinimide 0.7%, N-methyl-3-pyrroline-2-one 0.5%, acetamide 0.8%, diacetamide 0.3%, caproamide 0.2%, high boiling 1.5%.
[0035] The modified ceramic film in the apparatus adopts a commercial alumina ceramic film with a retained molecular weight of 10,000 daltons and is modified by post-treatment. The modification process of the ceramic film is that the cerami...
Embodiment 2
[0042] Crude glycol raw material with Example 1, distillation feed pretreatment system using a commercial alumina ceramic film with a retained molecular weight of 10,000 daltons is modified by post-treatment. The modification process of the ceramic film is the same as Example 1, the composition of the ceramic film modifier, according to the mass part, 5 parts of aluminum isopropanol, 5 parts of aluminum sec-butanol, 6 parts of polyvinylpyrrolidone, 15 parts of ethanol, 5 parts of toner of 400 to 600 mesh, 0.5 parts of lanthanum nitrate, 3 parts of hydroxyethyl cellulose, 5 parts of ammonium carbonate, according to the percentage of the remaining components divided into water; the intercepted molecular weight of the modified ceramic film is 950 daltons. The operating pressure of the ceramic membrane is 0.6MPa and the operating temperature is 50°C, and the interception rate of the membrane module on viscoelastic impurities such as oligomers is 68%. When the ceramic membrane pressure...
Embodiment 3
[0045]Crude glycol raw material with Example 1, distillation feed pretreatment system using a commercial alumina ceramic film with a retained molecular weight of 10,000 daltons is modified by post-treatment. The modification process of the ceramic film is that the ceramic film is impregnated in the modifier for 5 hours and the impregnation temperature is 70 °C; after the impregnated ceramic film is dried at room temperature, it is heated to 500 °C / min in a nitrogen atmosphere, and the constant temperature is 8 hours, and then naturally cooled to normal temperature in the nitrogen atmosphere. Ceramic membrane modifier composition, according to the mass of the parts, isopropanol aluminum 10 parts, sec-butanol aluminum 10 parts, polyvinylpyrrolidone 3 parts, ethanol 20 parts, 400 ~ 600 mesh toner 7 parts, lanthanum nitrate 2 parts, hydroxyethyl cellulose 2 parts, ammonium carbonate 7 parts, according to the percentage of the remaining components divided into water; the modified ce...
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