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Process for separating meta-xylene from a feed of aromatic hydrocarbons

一种间二甲苯、分离方法的技术，应用在分离方法、弥散粒子分离、吸附纯化/分离等方向，能够解决费用高、蒸馏分离困难等问题

Inactive Publication Date: 2007-04-04
INST FR DU PETROLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the molecules in the sample to be distilled tend to have close boiling points, thus making distillative separation difficult and expensive

Method used

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  • Process for separating meta-xylene from a feed of aromatic hydrocarbons
  • Process for separating meta-xylene from a feed of aromatic hydrocarbons
  • Process for separating meta-xylene from a feed of aromatic hydrocarbons

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] In this example, a breakthrough test (head chromatography) was carried out, evaluating the operating conditions described in US 4 306 107, i.e. using an adsorbent with a loss on ignition (assessed at 500°C) of 2.3% and an adsorption temperature of 120°C , and then according to the operating conditions described in US 5 900 523, that is, using an adsorbent with a loss on ignition (assessed at 500°C) of 1.75%, and an adsorption temperature of 125°C, to separate m-xylene from m-xylene / ortho-xylene mixture efficiency.

[0097] The composition of the material is as follows:

[0098] - m-xylene: 45% by weight:

[0099] - o-xylene: 45% by weight;

[0100] - Isooctane: 10% by weight (isooctane is used as an indicator to estimate the non-selective volume that does not take part in this separation).

[0101] The adsorbent is a zeolite of the Y faujasite type substituted with sodium. The amount of sorbent used in these experiments was about 55 g.

[0102] The activations requ...

Embodiment 2

[0124] In this example, a breakthrough test (head chromatography) was performed to evaluate tetralin efficiency in the separation of meta-xylene from a meta-xylene / ortho-xylene mixture.

[0125] A sodium-substituted Y faujasite-type zeolite (expressed as NaY) is used as the adsorbent, and the loss on ignition at 500° C. is less than 0.05% by weight. The adsorption temperature (same as the desorption temperature) was fixed at 160°C.

[0126] The experiment used a sorbent volume of 56.6 g prior to activation.

[0127] The adsorbent is then pretreated so that it is injected into the nitrogen column at room temperature with a flow rate of 40 l / h, and then the temperature is raised to 80 ° C, 150 ° C, 200 ° C, 250 ° C, 300 ° C and 400 ° C in stages, so that activation. Between these stages, the temperature was increased linearly with a ramp of 5°C / min.

[0128] The temperature of the other stages was maintained at 80°C and 400°C for 1 hour and 45 minutes, respectively. Figure 1...

Embodiment 3

[0158] In this example, a breakthrough test (head chromatography) was performed to evaluate tetralin efficiency in the separation of meta-xylene from a meta-xylene / ortho-xylene mixture.

[0159] A sodium-substituted Y faujasite-type zeolite (represented by NaY) was used as an adsorbent, and the loss on ignition at 500° C. of this zeolite was 2.2% by weight. The adsorption temperature (same as the desorption temperature) was fixed at 140°C.

[0160] The experiment used a sorbent volume of 55.9 g prior to activation.

[0161] The activation required to achieve a loss on ignition of 2.2% at 500° C. was performed externally in a tube furnace using a nitrogen flow of 400 l / h.

[0162] The loss on ignition at 500°C is less than 0.05%.

[0163] The operating conditions for achieving the penetration test and releasing the penetration test include the following operations:

[0164] 1) Refill the column with adsorbent and place the column in place in the test strip;

[0165] 2) refi...

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Abstract

The invention concerns a process for separating meta-xylene from a hydrocarbon feed comprising isomers containing 8 carbon atoms, comprising: a step for bringing the feed into contact with a faujasite type zeolite adsorbant, the percentage of water in the adsorbant being in the range 0 to 8% by weight and the adsorption temperature being from 25 DEG C to 250 DEG C; a desorption step employing a solvent selected from tetraline and its alkylated derivatives; a step for separating meta-xylene from the desorbant.

Description

technical field [0001] The present invention relates to a method for separating m-xylene from aromatic hydrocarbon materials containing 8 carbon atom isomers by using tetralin (tétraline) as a desorbent (désorbant) by liquid phase adsorption. [0002] This method finds application in particular in the production of high-purity meta-xylene, ie meta-xylene with a purity higher than 99.0%, preferably higher than 99.5%. [0003] Meta-xylene from this process is particularly useful in the preparation of pesticides or chemical intermediates such as isophthalic acid. Background technique [0004] Initially, the separation of meta-xylene from the aromatic material can be carried out using the usual separation techniques, among which chemical extraction or extractive distillation using suitable chemical reagents can be mentioned. [0005] Thus, US 4 585 526 describes a process for the separation of meta-xylene from an aromatic hydrocarbon material containing in particular o-xylene b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/08C07C7/13
CPCC07C7/13C07C15/08B01D53/02B01D53/85
Inventor P·勒夫莱维K·巴瑟勒特
Owner INST FR DU PETROLE
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