Method for separating small amount of ethylbenzene in alpha-methylbenzyl alcohol dehydration mixed liquor
A technology of methyl benzyl alcohol and mixed liquid, which is applied in the field of separation of a small amount of ethylbenzene in the dehydration mixed liquid of α-methyl benzyl alcohol, can solve the problems of tower kettle temperature rise, energy-saving design difficulties, etc., achieve high economic value, reduce control effect of difficulty
Active Publication Date: 2020-08-11
CHANGZHOU RUIHUA CHEM ENG&TECH
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Problems solved by technology
[0019] The characteristics of the temperature drop at the top of the ethylbenzene separation tower and the temperature rise at the bottom of the tower bring difficulties to the energy-saving design of the thermally coupled high and low pressure towers. Coupled Reboiler Heat Transfer Temperature Difference
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Embodiment 1
[0057] Embodiment 1: A kind of method of separating a small amount of ethylbenzene in the dehydration mixture of α-methyl benzyl alcohol
[0058] Taking 600,000 tons of styrene and 270,000 tons of propylene oxide co-oxidation device as an example, the separation device includes ethylbenzene crude fractionation tower T-101 and ethylbenzene fine fractionation tower T-102;
[0059] Ethylbenzene crude fractionation column T-101 is provided by ethylbenzene crude fractionation column reboiler E-101 for upward gas phase flow for mass transfer required for separation in the column, and ethylbenzene fine fractionation column T-102 is coupled by ethylbenzene fine fractionation column for reboiler Device E-102 and ethylbenzene fractionation tower auxiliary reboiler E-103 provide the required mass transfer for separation in the tower with upward gas phase flow;
[0060] The ethylbenzene / styrene steam 4 extracted from the top of the ethylbenzene crude fractionation column with higher press...
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Abstract
The invention discloses a method for separating a small amount of ethylbenzene in alpha-methylbenzyl alcohol dehydration mixed liquor. An ethylbenzene coarse separation tower with higher operation pressure and an ethylbenzene fine separation tower with lower operation pressure are arranged, ethylbenzene / styrene steam at the top of the ethylbenzene coarse separation tower is used as a heat source of an ethylbenzene fine separation tower coupling reboiler, and an ethylbenzene fine separation tower auxiliary reboiler taking surplus low-grade heat of the device as a heat source is arranged. The top of the ethylbenzene coarse separation tower is controlled to contain a certain amount of styrene so as to increase the hot side temperature of the ethylbenzene fine separation tower coupling reboiler and improve the heat transfer temperature difference. An ethylbenzene / styrene mixture separated from the top of the ethylbenzene coarse separation tower is fed into an ethylbenzene fine separation tower; and ethylbenzene with further reduced styrene content is separated from the top of the ethylbenzene fine separation tower together with ethylbenzene contained in the dehydrated liquid feed of the ethylbenzene fine separation tower, so that the problem of over-high energy consumption required for separating a small amount of ethylbenzene contained in the alpha-methylbenzyl alcohol dehydratedmixed liquid in the industry is better solved.
Description
technical field [0001] The invention belongs to the field of petrochemical industry and relates to a method for separating a small amount of ethylbenzene in a dehydration mixture of α-methyl benzyl alcohol. Background technique [0002] Styrene is an important petrochemical raw material and the third largest polymer monomer in output after ethylene and propylene. In my country, styrene is mainly used in the production of polystyrene and ABS / SAN resin. Among them, about 38% of the total consumption of styrene is used for the production of expandable polystyrene (EPS), about 31% of styrene is used for the production of non-expandable polystyrene (GPPS / HIPS), 10 % of styrene is used in the production of ABS / SAN resin, about 7% of styrene is used in the production of unsaturated polyester (UPR), and about 7% of styrene is used in the production of styrene-butadiene rubber / styrene-butadiene latex (SBR / SBL), others are mainly used for the production of styrenic copolymers (styre...
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IPC IPC(8): C07C7/04C07C15/073
CPCC07C7/04C07C15/073Y02P20/10
Inventor 张晶徐志刚吴非克张文明
Owner CHANGZHOU RUIHUA CHEM ENG&TECH