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Aromatic hydrocarbon treatment process

A treatment process and aromatics technology, applied in the petroleum industry, refined hydrocarbon oil, etc., can solve the problems of clay deactivation, catalyst performance degradation, etc., and achieve the effect of short regeneration time, high regeneration degree and enhanced effect

Active Publication Date: 2015-01-07
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Olefins are relatively active in nature, and can be polymerized under high temperature, oxygen-free and initiator-free conditions, forming colloids and other by-products, coke and carbon deposits on adsorbents and catalysts, etc., which to a certain extent caused the deactivation of clay and the deterioration of catalyst performance. reduce

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] As a neutral adsorbent, activated carbon generally has an adsorption capacity of 7% to 21%. Commercially available activated carbon was selected as the adsorbent in the experiment, and its performance parameters are shown in Table 1 below.

[0027] Table 1. Performance parameters of activated carbon

[0028]

[0029] Aromatics-containing raw materials are aromatics intermediate products from reforming units in the petrochemical industry (hereinafter referred to as feedstock oil), and their olefin content is less than 1%. The specific components are shown in Table 2 below.

[0030] Table 2. Main components of raw oil

[0031]

[0032] During the experiment, a bromine index tester was used to test the bromine index (Ye Hong, Tian Songbai. Analysis method of olefins in diesel oil. Changlian Technology, 2004,30(2):59-64). The bromine index of raw oil is around 900 mgBr / 100g oil.

[0033] A single adsorption bed device is schematically shown in figure 1 . The spec...

Embodiment 2

[0036] Sorbent and aromatic raw material are the same as in Example 1. The adsorption device consists of two single adsorption beds in Example 1, schematically shown in figure 2 . When valves 1 and 2 are opened and valves 3 and 4 are closed, the adsorption bed I will be adsorbed. When the bromine index of the outlet oil of adsorption bed I is higher than 20mgBr / 100g oil, valves 1 and 2 will be closed and valves 3 and 4 will be opened, and the adsorption bed will Ⅰ is regenerated, and the raw material enters the adsorption bed Ⅱ at the same time; similarly, when the bromine index of the outlet oil of the adsorption bed Ⅱ is higher than 20mgBr / 100g oil, the adsorption bed Ⅱ is regenerated, and the raw material enters the adsorption bed Ⅰ at the same time. The adsorption and regeneration conditions of the adsorption bed are also the same as in Example 1. The adsorption period of activated carbon is about 2 days, and it can continue to be used after regeneration. Compared with...

Embodiment 3

[0038] Sorbent and aromatic raw material are the same as in Example 1. In this example, three single adsorption beds I, II, and III in Example 1 are used for cyclic adsorption, in which two adsorption beds are adsorbed in series, and the other adsorption bed is regenerated, as shown in image 3 . The reason why two beds are operated in series is to ensure that the bromine index of the product is lower than 20mgBr / 100g oil, and it also prolongs the service life of the adsorbent, because the first bed can be used until the adsorbent is deactivated. Some olefins pass through the first bed into the second bed before total deactivation, and the slip-through olefins are absorbed by the second bed, leaving the product still within specification. When the bromine index of the oil at the outlet of the adsorption bed exceeds 300 mgBr / 100g oil, we consider that the adsorbent has been deactivated, and the adsorption can be terminated and regeneration can be carried out. Such as image ...

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Abstract

The invention relates to an aromatic hydrocarbon treatment process. The process comprises the following steps of: feeding an aromatic hydrocarbon raw material to enter an adsorbent bed filled with an adsorbent by adopting a neutral or alkalescent adsorbent, and adsorbing and removing trace olefin in aromatic hydrocarbon under constant temperature; raising the temperature of the adsorbent bed to regenerative temperature under a pressure reduction condition when the adsorbing capacity of the adsorbent is saturated; and distilling impurities including olefin and olefin polymer to regenerate the adsorbent. The process has the characteristics that (1) the adsorbent is neutral or alkalescent, so that the adsorbent does not have an acid activity center and reduces the aggregation of the olefin; (2) a temperature swing adsorption mode is adopted and the regeneration temperature is strictly controlled so as to reduce the probability of forming colloids and coking carbon deposition caused by polymerization of aromatic hydrocarbon, olefin and the like on the adsorbent; and (3) auxiliary desorption is in a pressure reduction mode to guarantee the regeneration effect of the adsorbent. By the aromatic hydrocarbon treatment process, the adsorbent is easy to regenerate and long in service life; and the process is simple, convenient to operate and suitable for industrial application.

Description

technical field [0001] The invention belongs to the technical field of adsorption and separation, and relates to an aromatic hydrocarbon treatment process, in particular to a process for removing trace olefins in aromatic hydrocarbons. Background technique [0002] Aromatics are important raw materials for the petrochemical industry. Aromatic products obtained from processes such as naphtha reforming and steam cracking contain not only aromatics such as benzene, toluene, and xylene, but also a certain amount of olefins (monoolefins, dienes, and styrene, etc.) and some heterocyclic compounds . These olefins are relatively active, especially diolefins, which are easy to polymerize to form colloids and other by-products, affecting the quality and purity of aromatics; at the same time, their existence will also have adverse effects on some subsequent chemical processes, such as in high-temperature reactors Coking, polluting the heat transfer surface of operating equipment, red...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G25/00C10G25/12
Inventor 黄彦王杉杉
Owner NANJING TECH UNIV
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