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Catalytic cracking method of naphtha feedstock

A catalytic cracking and naphtha technology, which is applied in the field of catalytic cracking of naphtha raw materials, can solve the problems of constant or reduced yield, and achieve the effect of increasing yield and improving economy

Active Publication Date: 2016-03-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this invention is that the structure of the two riser reactors is the same, and the reaction conditions are similar. Using the same catalyst, the C4~C12 components that do not contain aromatics in the reactants can be combined with fresh naphtha. The catalytic cracking reaction is carried out in the first riser, which simplifies the structure
[0006] The method of the above patent application mainly focuses on improving the yield of ethylene and propylene in the catalytic cracking product of naphtha, and does not involve how to increase the yield of ethylene and propylene while making the non-ideal product hydrogen in the catalytic cracking product of naphtha The yields of , methane and coke remain unchanged or decrease

Method used

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  • Catalytic cracking method of naphtha feedstock
  • Catalytic cracking method of naphtha feedstock
  • Catalytic cracking method of naphtha feedstock

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0077] According to an embodiment of the present invention, the olefin-rich C4 separated during the product separation process may be injected into the first reaction zone and / or the second reaction zone to participate in the reaction again. The olefin-rich C4 that can be recycled by injecting into the first reaction zone and / or the second reaction zone can account for more than 20% by weight, preferably 50% by weight, of the total amount of olefin-rich C4 separated during the product separation process above.

[0078] In the method provided by the present invention, the temperature of the first catalytic cracking catalyst may be 560-650°C, the temperature of the second catalytic cracking catalyst may be 660-760°C, and the second catalytic cracking catalyst The temperature may be 10-150°C higher than the temperature of the first catalytic cracking catalyst. In the present invention, each of the first catalytic cracking catalyst and the second catalytic cracking catalyst may b...

Embodiment 1

[0101]This example is to illustrate the catalytic cracking effect of the method provided by the present invention after the raw material naphtha 1 is sequentially entered into two reaction zones and under respective reaction conditions.

[0102] The experiment was carried out on a catalytic cracking unit with a medium-sized fluidized bed and a riser. Such as figure 1 Shown, the internal diameter of catalyst delivery pipe 5 in this medium-sized device is 16 millimeters, and length is 160 millimeters, and catalyst delivery pipe 5 outlets connect the fluidized bed reactor 1 of gradually expanding diameter, and the lower end internal diameter of fluidized bed reactor 1 is 16 millimeters. mm, the inner diameter of the upper end is 104 mm, and the height is 392 mm. The inner diameter of the riser reactor 6 is 16 mm, and the length is 3800 mm. The test is operated in a single pass mode.

[0103] The first catalytic cracking catalyst at 640°C is introduced into the bottom of the cata...

Embodiment 2

[0107] Catalytic cracking of naphtha 1 is carried out according to the method of embodiment 1, and the experimental device adopted is the same as embodiment 1, and the difference is that the reaction temperature of the riser reactor is increased to 645 ° C, and the regeneration of the second regenerator is carried out simultaneously The temperature was raised to 710°C. The operating parameters and product analysis results in the experiment are shown in Table 3.

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Abstract

The present invention relates to a catalytic cracking method of a naphtha feedstock, the method is as follows: (a) the naphtha feedstock is contacted with a first catalytic cracking catalyst in a first reaction zone for reacting to obtain a first oil mixture, the first oil mixture is isolated to obtain a first spent catalyst and a first reaction oil gas, and the first reaction oil gas is isolated into C1-C4 small molecule hydrocarbons, and C5 + components; (2) at least a portion of the C5 + components and a second catalytic cracking catalyst are introduced into a second reaction zone to react, an obtained second oil mixture is isolated to obtain a second spent catalyst and a second reaction oil gas, the reaction temperature of the second reaction zone is higher than the reaction temperature of the first reaction zone, and the temperature of the second catalytic cracking catalyst is higher than the temperature of the first catalytic cracking catalyst. The catalytic cracking method of the naphtha feedstock can achieve improvement of yield of ethylene and propylene and meanwhile significant reduction of yield of non-ideal product hydrogen gas, methane and coke.

Description

technical field [0001] The invention relates to a method for catalytic cracking of naphtha raw materials, in particular to a method for catalytic cracking of naphtha raw materials which reduces the yield of non-ideal products. Background technique [0002] Modern petroleum processing technology pays more attention to reducing energy consumption per unit of raw material processing and reducing carbon emissions while pursuing the yield of high-value products (such as ethylene, propylene, and C8 aromatics). Hydrogen, methane, and coke, which are by-products of petroleum hydrocarbon processing in modern refineries, are often disposed of through combustion, which is the main source of carbon emissions in refineries, which greatly reduces the economics of atomic processing. [0003] Patent application CN102746888A discloses a method for producing ethylene propylene by fluidized catalytic cracking. In this invention, under the conditions of 600-750°C, water-to-oil weight ratio of ...

Claims

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Application Information

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IPC IPC(8): C10G11/00C07C11/04C07C11/06
CPCY02P20/52
Inventor 朱金泉高永灿谢朝钢崔琰杨轶男
Owner CHINA PETROLEUM & CHEM CORP
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