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Naphtha modification method

A naphtha and upgrading technology, which is applied in the treatment of naphtha, petroleum industry, hydrocarbon oil, etc., can solve the problems of short single-pass operation period, low distillation range requirements, and low equipment investment, etc., so as to extend the single-pass operation cycle, increase the yield of liquid products, and improve the effect of octane number yield

Active Publication Date: 2021-04-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology has strong raw material adaptability, low requirements on raw material impurity content, aromatics potential content and distillation range range, and at the same time, the reaction system is not hydrogenated and can be operated at low pressure, with less equipment investment and low energy consumption. However, compared with the catalytic reforming process, there are two outstanding problems in naphtha aromatization upgrading technology, one is the low yield and octane number of liquid products, The second is that the single-pass operation cycle is short. The fixed-bed process needs to regenerate the catalyst for 60-80 days to produce gasoline, but only 15-20 days to produce aromatics.

Method used

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Effect test

Embodiment approach

[0021] A specific embodiment, the naphtha feedstock can be sent to a plurality of fixed-bed reaction zones arranged in series, and the dehydrogenation reaction zone and / or upgrading reaction zone can be an independent fixed-bed reactor or composed of more than one series-connected Composition of fixed bed reactors. No separation unit is arranged between adjacent fixed-bed reactors, and the product from the upstream fixed-bed reactor directly enters the downstream adjacent fixed-bed reactor.

[0022] In another embodiment, the naphtha raw material can be sent into a fixed bed reactor, which includes a dehydrogenation reaction zone and a reforming reaction zone arranged in series, between the dehydrogenation reaction zone and the reforming reaction zone Without a separation unit, the product mixture from the dehydrogenation reaction zone directly enters the upgrading reaction zone.

[0023] According to the present invention, when the activity of the modified catalyst in the mo...

specific Embodiment approach

[0028] According to the present invention, under the conditions of the dehydrogenation reaction, the naphtha raw material is contacted with the dehydrogenation catalyst in the dehydrogenation reaction zone, and part of the naphthenes in the naphtha raw material can be converted into aromatic hydrocarbons through the dehydrogenation reaction. On the one hand, this increases the aromatics content and octane number of the upgraded liquid product; on the other hand, it reduces the cracking of naphthenes in the naphtha raw material during the upgrading reaction, effectively improving the selectivity of the naphtha upgrading process and liquid product yields. In a specific embodiment, the method may further include: based on the total mass of naphthenes in the naphtha feedstock, converting 20-50% by mass of naphthenes into aromatics in the dehydrogenation reaction zone. Preferably, 25-50% by mass of naphthenes are converted to aromatics. There is no specific limitation on the metho...

Embodiment 1

[0044] Preparation of dehydrogenation catalyst.

[0045] Take 100 grams (dry basis 95 grams) of γ-Al 2 o 3 The carrier is used as the first carrier, and its saturated water absorption is measured to be 82mL, and a predetermined amount of chloroplatinic acid and hydrochloric acid are used to prepare 140mL of impregnating solution, so that the impregnating solution contains 0.5% by mass of Pt and 1.9% by mass of Cl (both dry with respect to alumina. base mass), the volume ratio of impregnating liquid to carrier is 1.05:1. Divide the carriers into flasks, introduce the impregnating liquid under the pressure of 0.085MPa, rotate and impregnate at 30°C for 3 hours, and rotate at a linear speed of 0.10 m / s, then dry under reduced pressure, and then in dry air at 500°C, gas / Calcined for 4 hours under the condition of solid volume ratio 700:1. The catalyst prepared by the above method contains 0.5% by mass of Pt and 1.0% by mass of Cl based on the dry alumina carrier.

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Abstract

The invention relates to a naphtha modification method, which comprises the following steps of: introducing a naphtha raw material into a dehydrogenation reaction zone and a modification reaction zone which are arranged in series, and enabling the naphtha raw material to be in contact with a dehydrogenation catalyst in the dehydrogenation reaction zone under a dehydrogenation reaction condition; when the activity of a modification catalyst is reduced, stopping the introduction of the naphtha raw material, carrying out activation treatment on the modification catalyst under a circulating gas circulating condition, with the activation treatment temperature being increased by 0-50DEG C compared with the modification reaction temperature when the introduction of the naphtha raw material is stopped, and after the activation treatment is carried out on the modification catalyst, further introducing the naphtha raw material to carry out reaction. The method disclosed by the invention can prolong the one-way operation period of the naphtha raw material dehydrogenation and modification combined process and the service life of the catalyst, and improve the yield and octane number of the liquid product.

Description

technical field [0001] The invention relates to a method for upgrading naphtha, in particular to a method for upgrading naphtha through two-stage reactions. Background technique [0002] With the upgrading of environmental protection requirements and the introduction of new gasoline standards, some low-octane gasoline, such as reformed top oil, condensate, partially hydrocoked gasoline and straight-run gasoline, etc., urgently need to find suitable processing technology. Although this part of naphtha is suitable as ethylene raw material, it is difficult to transport due to its high vapor pressure. If there is no ethylene plant near the enterprise, it is difficult to use it for ethylene production. At present, catalytic reforming is the main device used by refineries to produce aromatics and high-octane gasoline blending components. Reformed gasoline, as a gasoline blending component, has the characteristics of high octane number and high yield of liquid products, but its ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G59/02
CPCC10G59/02C10G2300/70C10G2300/703C10G2300/104C10G2300/1044
Inventor 任坚强于中伟王子健马爱增王杰广张新宽马冲马云超董晨刘彤
Owner CHINA PETROLEUM & CHEM CORP
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