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Method for recovering ethanol and co-producing ethylene glycol
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A kind of ethylene glycol, ethanol technology
Pending Publication Date: 2020-02-25
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0016] The invention provides a method for ethanol recovery and co-production of ethylene glycol, which mainly solves the problems of ethanol separation and recovery and 1,4-dioxane wastewater treatment difficulties and high separation energy consumption in the prior art
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Embodiment 1
[0033] according to figure 1 In the process shown, the feed of the mixed solution is 1000kg / h, the feed composition of the mixed solution is 80wt% ethanol, 15wt% 1,4-dioxane, 5wt% water, and the flow rate of ethylene oxide is 122.27kg / h.
[0034] Reactor A has a reaction pressure of 0.5MPA and a heat release of 54kW.
[0035] The theoretical plate number of the first separation column is 30, the operating pressure is 0.21MPaA, the temperature at the top of the column is 98°C, and the load at the bottom of the column is 262kW.
[0036] The theoretical plate number of the second separation column is 80, the operating pressure is 0.20MPaA, the temperature at the top of the column is 97°C, and the load at the bottom of the column is 15.28MW.
[0037] The purity of the ethanol product is 99.50wt%, the recovery rate is 99.45%, the by-product ethylene glycol is 127.26kg / h, and the purity of the by-product ethylene glycol is 99.99%.
Embodiment 2
[0039] according to figure 1 In the process shown, the feed of the mixed solution is 1000kg / h, the feed composition of the mixed solution is 80wt% ethanol, 15wt% 1,4-dioxane, 5wt% water, and the flow rate of ethylene oxide is 122.27kg / h.
[0040] The reaction pressure is 0.5MPA, and the heat release is 54kW.
[0041] The theoretical plate number of the first separation column is 35, the operating pressure is 0.31MPaA, the temperature at the top of the column is 110°C, and the load at the bottom of the column is 285kW.
[0042] The theoretical plate number of the second separation column is 80, the operating pressure is 0.30MPaA, the temperature at the top of the column is 109°C, and the load at the bottom of the column is 2.22MW.
[0043] The purity of the ethanol product is 99.55wt%, the recovery rate is 99.55%, the by-product ethylene glycol is 127.26kg / h, and the purity of the by-product ethylene glycol is 99.99%.
Embodiment 3
[0045] according to figure 1 In the process shown, the feed of the mixed solution is 1000kg / h, the feed composition of the mixed solution is 80wt% ethanol, 15wt% 1,4-dioxane, 5wt% water, and the flow rate of ethylene oxide is 122.27kg / h.
[0046] The reaction pressure is 0.5MPA, and the heat release is 54kW.
[0047] The theoretical plate number of the first separation column is 40, the operating pressure is 0.41MPaA, the temperature at the top of the column is 119°C, and the load at the bottom of the column is 299kW.
[0048] The theoretical plate number of the second separation column is 75, the operating pressure is 0.40MPaA, the temperature at the top of the column is 118°C, and the load at the bottom of the column is 1.4MW.
[0049] The purity of the ethanol product is 99.60wt%, the recovery rate is 99.6%, the by-product ethylene glycol is 127.26kg / h, and the purity of the by-product ethylene glycol is 99.99%.
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Abstract
The invention relates to a method for recovering ethanol and co-producing ethylene glycol. A purpose of the invention is mainly to solve the problems of difficult ethanol separation and recovery, difficult 1,4-dioxane wastewater treatment and high separation energy consumption in the prior art. According to the technical scheme, a mixed solutionstream containing water, ethanol and 1,4-dioxane andan ethyleneoxidestream containing ethyleneoxide are fed into a reactor, contact under the conditions suitable for a reaction of ethylene oxide and water, and are subjected to a reaction to obtaina crude product stream containing ethylene glycol, ethanol and 1,4-dioxane; the crude product stream is fed into a first separation tower and is separated to obtain a crude ethanol stream containing ethanol and 1,4-dioxane and an ethylene glycol stream; and the crude ethanol stream containing ethanol and 1,4-dioxane is fed into a second separation tower to obtain an ethanol stream and a 1,4-dioxane stream. With the technical scheme of the invention, the problems in the prior art are well solved. The method of the invention can be applied to ethanol recovery process production.
Description
technical field [0001] The invention relates to a method for ethanol recovery and co-production of ethylene glycol, specifically, a process for recovering ethanol from a 1,4-dioxane solvent. Background technique [0002] Ethanol, commonly known as alcohol, molecular formula C 2 h 6 O, according to GB / T394.1-2008 industrial alcoholnational standard, excellent grade ≥ 96% vol, first grade ≥ 95% vol; according to GB / T678-2002 absolute ethanol national standard, chemical purity ≥ 99.5wt%, water content ≤ 0.5 %wt; analytical purity ≥99.7%wt, water content ≤0.3%wt; superior grade ≥99.8%wt, water content ≤0.2%wt; ethanol has a wide range of uses, ethanol can be used to manufacture acetic acid, beverages, flavors, dyes, fuels Wait. Ethanol with a volume fraction of 70% to 75% is also commonly used as a disinfectant in medical treatment, and it is widely used in national defense chemical industry, medical and health care, food industry, and industrial and agricultural production....
Claims
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Application Information
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