Method for enriching mesitylene from C9 aromatics
A technology for mesitylene and carbon 9 aromatics, applied in the field of separation of carbon 9 aromatics, can solve the problems of high energy consumption, high reflux ratio, poor economic benefits, etc., and achieve the effects of increasing temperature difference, saving energy consumption and increasing temperature
Active Publication Date: 2010-06-09
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0005] At present, most of the enrichment of mesitylene fractions from C9 aromatics mixtures adopts precision rectification. Since the boiling point difference of each component in the C9 aromatics fractions is small, to obtain enriched mesitylene fractions with less impurity content, the separation The required number of distillation column trays is large (>120), the reflux ratio is high, the required energy consumption is quite high, and the economic benefit is poor
Method used
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Embodiment 1
[0049] according to figure 1 In the flow process shown, 1000Kg C9 aromatics raw material a is introduced from the middle of the weight removal tower T1, and the light component material b lower than the boiling point of p-trimethylbenzene is drawn from the top of the tower, which mainly contains n-propylbenzene, m-methylethylbenzene, p- Light components such as methyl ethyl benzene, mesitylene and o-methyl ethyl benzene, etc., lead out from the tower kettle to the heavy component c mainly containing mesitylene and trimethylbenzene;
[0050] The light component material b drawn from the top of the weight removal tower T1 is used as the heat source of the reboiler R3 of the weight removal tower T2, and the reboiler R2 is used as a heat supplement for the insufficient load of the reboiler R3;
[0051] The components drawn from the top of the weight removal tower T1 partly enter the middle part of the weight removal tower T2 after heat exchange with the light removal tower reboile...
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The invention discloses a method for enriching mesitylene from C9 aromatics. The method comprises the following steps of: importing a mixture of C9 aromatics from the middle part of a heavy component eliminating tower, increasing the pressure in the heavy component eliminating tower, and exporting light components serving as a heat source of a reboiling device of a light component eliminating tower from the tower top; and making the light components enter the light component eliminating tower, and exporting a mesitylene enriched stream from the tower bottom of the light component eliminating tower. On the basis of hardly changing the conventional process, the method only increases the operating pressure in the heavy component eliminating tower, so that the energy consumption is saved by over 30 percent, the content of low-boiling point impurities in the enriched mesitylene is lowered, and the yield of the mesitylene is almost the same as that of the conventional process.
Description
technical field [0001] The invention relates to a method for separating C9 aromatics, in particular to a method for enriching mesitylene from C9 aromatics. Background technique [0002] The development of C9 aromatics deep processing technology and the utilization of various components have always been a concern of people. The composition of the by-product C9 aromatic fractions in different chemical processes is different, and its basic components, such as mesitylene, mesitylene, methylethylbenzene, etc., are important chemical resources. The separation and utilization of the increasing fraction of C9 aromatics has far-reaching significance for improving the economic benefits of related devices and comprehensively utilizing petroleum resources. [0003] At present, the main process routes for the production of mesitylene include the isomerization method of mesitylene, extractive distillation method, molecular sieve adsorption separation method, complexation / separation metho...
Claims
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IPC IPC(8): C07C15/02C07C7/04
Inventor 冯海强高继东鲁耘胡競民刘永富
Owner CHINA PETROLEUM & CHEM CORP