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System and method for long-cycle operation of C8 aromatic hydrocarbon olefin removal

A technology for removing olefins and a long period of time, applied in chemical instruments and methods, processing hydrocarbon oil, hydrocarbon oil processing products, etc., can solve the problems of frequent, inability to directly supply adsorption and separation devices, and heavy loading and unloading workloads.

Active Publication Date: 2016-11-16
NINGBO ZHONGJIN PETROCHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current situation is that the life of clay is extremely short, sometimes only 7 days, and the replacement and commissioning cycle of clay is about 10 days, resulting in a large and frequent loading and unloading workload, and a large amount of waste clay is produced at the same time; determination of C8 olefin content during loading and unloading of clay The index bromine index cannot meet the feed requirements of xylene adsorption separation, and cannot directly supply the adsorption separation device, which increases the energy consumption of the device

Method used

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  • System and method for long-cycle operation of C8 aromatic hydrocarbon olefin removal
  • System and method for long-cycle operation of C8 aromatic hydrocarbon olefin removal

Examples

Experimental program
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Effect test

Embodiment 1

[0027] refer to figure 1 As shown, a system for long-term operation of C8 aromatics deolefins in this embodiment includes C8 aromatics feed heat exchanger 1, C8 aromatics feed air cooler 2, ordinary clay tower 3, modified clay tower A4, modified The C8 aromatics feed main pipeline of the clay tower B5 is divided into two bypass pipelines, which are respectively connected to the C8 aromatics feed heat exchanger 1 inlet and the C8 aromatics feed air cooler 2 inlet, and the C8 aromatics feed heat exchanger 1 The outlet pipeline and the C8 aromatics feed air cooler 2 outlet pipeline merge into a main delivery pipeline; the main delivery pipeline is connected to the inlet pipeline of the ordinary clay tower 3, and a cross-line pipeline is arranged between the inlet pipeline and the outlet pipeline of the ordinary clay tower 3, There is a valve on the cross-line pipeline. When the ordinary clay fails, the C8 aromatic material will go to the bypass, and the ordinary clay tower 3 will...

Embodiment 2

[0029] The preparation method of the modified white clay is as follows:

[0030] Step 1. Take 30 parts by weight of bentonite, after crushing, add 1.5 parts by weight of silicotungstic acid, mix well, make a mixed acid of tartaric acid and sulfuric acid with a concentration of 20wt% sulfuric acid and saturated tartaric acid in a volume ratio of 7:3, and mix it with The acid adjusts the pH value of the mixed material to 5, pulverizes, and dries to obtain pretreated bentonite;

[0031] Step 2, adding lanthanum nitrate solution and molybdenum nitrate solution to the pretreated bentonite respectively, the mass fraction of lanthanum element in the lanthanum nitrate solution is 0.03%, the mass volume ratio of bentonite to lanthanum nitrate solution is 2g / ml, molybdenum in the molybdenum nitrate solution The element mass fraction is 0.06%, the mass volume ratio of bentonite and molybdenum nitrate solution is 5g / ml, ultrasonically stirred for 2 hours, then immersed for 24 hours, and d...

Embodiment 3

[0034] Step 1, take 40 parts by weight of bentonite, after crushing, add 2 parts by weight of heteropoly acid, mix well, make a mixed acid of tartaric acid and sulfuric acid with a concentration of 20wt% sulfuric acid and saturated tartaric acid in a volume ratio of 5:3, and mix it with The acid adjusts the pH value of the mixed material to 6, pulverizes, and dries to obtain pretreated bentonite;

[0035] Step 2, add praseodymium nitrate solution and zirconium nitrate solution to the pretreated bentonite respectively, the mass fraction of praseodymium element in the praseodymium nitrate solution is 0.5%, the mass volume ratio of bentonite to praseodymium nitrate solution is 5g / ml, and the zirconium in the zirconium nitrate solution The element mass fraction is 0.8%, the mass volume ratio of bentonite and zirconium nitrate solution is 6g / ml, ultrasonically stirred for 3 hours, then immersed for 36 hours, and dried to obtain modified bentonite;

[0036] Step 3: Add additives and...

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Abstract

The invention discloses a system and method for long-cycle operation of C8 aromatic hydrocarbon olefin removal. A C8 aromatic hydrocarbon material is subjected to heat exchange through a heat exchanger or cooled through an air cooler and then enters a common clay tower, the common clay tower is only used for adsorbing heavy components such as colloid in the raw material, and the common clay tower continues to be used when the pressure drop of the common clay tower is increased, so that the service life of common clay is greatly prolonged; the C8 aromatic hydrocarbon with colloid removed enters two modified clay towers in serial operation, olefin in the C8 aromatic hydrocarbon is removed, and due to the protection effect of the common clay, the service life of modified clay arranged in the upstream is also prolonged; after the upstream modified clay fails, olefin is removed with downstream modified clay only, the upstream modified clay is isolated and cut away and is replaced with new modified clay, and series connection is carried out again after the upstream modified clay is replaced with the new modified clay which is arranged in the downstream. By means of the method, the operation cycle of C8A olefin removal is prolonged while the workload of loading and unloading waste clay and the output of waste clay are reduced to the maximum, and thus the method has significant economic benefits.

Description

technical field [0001] The invention belongs to the field of petrochemical production, and specifically refers to a system and method for deolefinizing C8 aromatic hydrocarbons for long-term operation. Background technique [0002] Adsorption and separation of C8 aromatics is an important method for the preparation of p-xylene, but if C8 aromatics contain olefins, the olefins will polymerize on the surface of the adsorption separation adsorbent, thereby seriously reducing the compatibility of the adsorbent, and these polymers are difficult to remove. Cause permanent poisoning of adsorbent. Therefore, the deolefination of the clay tower in the upstream device of adsorption separation is very important. It is required that the bromine index of C8 aromatic hydrocarbons entering the adsorption separation tower does not exceed 20mg / 100g. If the bromine index exceeds 20mg / g, it must be replaced with new clay. [0003] The current situation is that the life of clay is extremely sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G53/08B01J20/12B01J20/30C07C7/12C07C15/08
CPCB01J20/0203B01J20/0207B01J20/0211B01J20/0218B01J20/12C07C7/12C10G53/08C10G2300/201C10G2400/30C07C15/08
Inventor 赵伟颜洁杨彦珺王鸿燕张风雷
Owner NINGBO ZHONGJIN PETROCHEM CO LTD