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A technology of propylene oxide and purification method, applied in the direction of organic chemistry, etc., can solve the problems of difficult separation, low purity of propylene oxide products, etc.
Inactive Publication Date: 2016-05-18
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0006] The technical problem to be solved by the present invention is that the propylene oxide product has low purity and is difficult to separate. A new refining method for propylene oxide is provided. When the method is used for the refining of propylene oxide, the propylene oxide product has high purity, The advantage of effective separation of impurities is that the reaction product of cumene hydroperoxide and propylene contains water, propylene, propane, acetaldehyde, propionaldehyde, acetone, and 2-methylpentane obtained after recovering propylene and separating the product. , 2-methylpentene, 3-methylhexane, methylcyclopentane, 1,5-hexadiene and other hydrocarbon impurities crude propylene oxide refining method for multiple extraction and rectification , to effectively separate and remove the above-mentioned impurities in turn, while obtaining a qualified product of polymer-grade propylene oxide with a purity exceeding 99.9wt%, it can reduce the cost of the extraction agent
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Embodiment 1
[0042] Contains water, propylene, propane, acetaldehyde, propionaldehyde, acetone, 2-methylpentane, 2-methylpentene, 3-methylhexane, methylcyclopentane, 1,5-hexadiene, etc. Hydrocarbon impurity stream 2 crude propylene oxide is fed from the lower part of T101 tower, the flow rate of stream 2 is 10t / h, stream 1 extractant propylene glycol is fed from the upper part of T101 tower, and the extractant and crude propylene oxide are countercurrently contacted in the tower , T101 tower theoretical plate number 52, the ratio of the feed mass flow rate of extractant propylene glycol and crude propylene oxide is 1:2.5, operating pressure is controlled at 140kPa, reflux ratio 1.5;
[0043] The composition and content of stream 2 (crude propylene oxide) are as follows:
[0044] Table 1 Crude propylene oxide composition and content
[0055] process such as figure 2 As shown, the T104 tower still liquid is divided into 3 parts, and stream I (15%) is directly recycled to the ethylbenzene peroxidation unit as a reaction raw material (not marked in the figure), stream II (25%) goes to T105 tower, stream III (60 %) to T103 tower as extractant.
[0056] T105 tower has 30 theoretical plates, operating pressure of 120kPa, reflux ratio of 400, and energy consumption of 30% of that of Example 1.
[0057] Propylene oxide content ≥ 99.9wt% in logistics 15, total aldehyde (calculated as propionaldehyde + acetaldehyde) 10mg / kg, hydrocarbon impurity less than 5ppm, water 1ppm, impurity content such as acetone is negligible, propylene oxide recovery rate Reached 99.5%.
[0058] As can be seen from the above, the implementation of the present invention can separate and obtain the polymer grade propylene oxide qualified product in an economical and convenient manner.
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Abstract
The invention provides a refining method of propylene oxide (PO). The method is a method for refining a crude propylene oxide product prepared through a process for preparing propylene oxide through a CHP (cumene hydroperoxide) method. According to the invention, in a de-heavy tower, C2-C6 alkyldiol is adopted as an extraction agent for removing impurities such as water, propionaldehyde and acetone; bottom liquid enters a solvent recovery tower wherein the extraction agent is recovered, and the extraction agent is circulated and fed from the upper part of the de-heavy tower; in a de-light tower, impurities such as C3-C4 light hydrocarbon and acetaldehyde in de-heavy tower top distillate are removed; de-light tower bottom liquid enters an extraction tower wherein C7-C20 hydrocarbon is adopted as an extraction agent for removing impurities such as residual acetaldehyde and water; extraction tower bottom liquid enters a product tower wherein C7-C20 hydrocarbon is adopted as an extraction agent for removing C5-C6 light hydrocarbon, and a propylene oxide product is obtained at the tower top; and product tower bottom liquid enters a solvent stripping tower wherein the extraction agent C7-C20 hydrocarbon is recovered.
Description
technical field [0001] The present invention relates to the refining method of propylene oxide, in more detail, the present invention mainly relates to the refining method of CHP (cumyl hydroperoxide) legal system propylene oxide, this method is to contain water, propylene, propane, acetaldehyde, Crude propylene oxide removal of hydrocarbon impurities such as propionaldehyde, acetone, 2-methylpentane, 2-methylpentene, 3-methylhexane, methylcyclopentane, 1,5-hexadiene The refining method effectively separates and removes the above-mentioned impurities step by step to obtain qualified polymer-grade propylene oxide products. Background technique [0002] Propylene oxide is an important organic chemical raw material, and it is the third largest product of propylene (after polypropylene and acrylonitrile). Propylene oxide is mainly used to produce polypolyol (polyether), and then to make polyurethane, which is currently the most important use of propylene oxide, but only propyle...
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