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Study of Recovery of Acetic Acid from Furfural Wastewater and Furfural Production from Xylose Mother Liquor

Author: LiJiaBo
Tutor: LiPingLi
School: Tianjin University
Course: Chemical Engineering
Keywords: Furfural Acetic acid Xylose mother liquor Extraction High boiling extractant
CLC: TQ251
Type: Master's thesis
Year: 2007
Downloads: 299
Quote: 2
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Abstract


Furfural is an important chemical products, and its wide range of applications of furfural production in the world, wastewater pollution and low furfural yield problems, however, restrict the the furfural industry's sustainable development, these two issues were. Furfural wastewater pollution, which contains about 2% acetic acid, biochemical treatment of furfural wastewater costs and can not recover the acetic acid, such as acetic acid wastewater successful recovery will have significant social and economic benefits. In this paper, a high boiling extractant acetate furfural wastewater recycling study. First, by measuring the different proportions of the extraction agent extraction of acetic acid distribution coefficient and the viscosity of the extractant, to various parameters of each component in the extraction agent, to determine the best ratio of the mixed extractant. Then pulsed packed column Hebei Promise (2.84%) and Xuanhua (1.43%), waste water extraction experiments from the the Liaoning Tieling (1.65%) of the acetic acid concentration, the study compared to the pulse time and pressure, the concentration of acetic acid etc. For the extraction efficiency, the results showed that: different concentrations of furfural wastewater, use of self extracting agent, suitable for comparison, the pulse time 3s, pulse pressure 0.04MPa allows the extraction efficiency of 99%. Use time) in order to extend the extraction agent used in the recycling process of the extraction agent, in order so that the distillation temperature is reduced (vacuum distillation, the overhead to give a concentration of about 60% aqueous acetic acid. Direct catalytic furfural manufacturer in China more than a one-step sulfuric acid, furfural yield lower is generally about 50%, resulting in a large number of waste residue, low utilization rate of raw materials, and the catalyst of sulfuric acid can not be recycled. The furfural production method of the two-step method can be generated by optimizing the second step, i.e. pentose dehydration the furfural reaction conditions to improve the second step of the furfural yield, thus improving the entire process furfural yield. Acetate as a catalyst, mature furfural wastewater acetic acid recovery process development case, you can achieve the furfural production of acetate extractant recycling reuse. Xylose mother liquor by-product in the production process of crystallization of xylose xylose production enterprises as raw material, the use of acetic acid as the catalyst the furfural production of the two-step method in the second step of the investigation, reaction time, reaction temperature, acetic acid concentration and xylose mother liquor concentration affect for furfural yield in the pentose initial concentration of 16.92%, has been optimized reaction conditions for recovery time 375min reaction temperature of 180 ° C, the acetic acid concentration of 4.5%, the furfural yield reached 80.4% .

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CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of heterocyclic compounds > Five heterocycles containing a single different atoms
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