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Method for regulating the molecular structure of heavy oil

A molecular structure, heavy oil technology, applied in the petroleum industry, catalytic cracking, cracking and other directions, can solve problems such as unfavorable catalytic cracking and stable operation

Active Publication Date: 2021-01-15
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Even if the optimum airspeed disclosed by the patent is 40~50h -1 It is helpful to suppress the condensation of free radical mechanism from the reaction kinetics, but in the description of the process characteristics, there is still the conclusion that "a small amount of solid coke is formed on the catalyst", which is obviously not conducive to the stable operation of catalytic cracking

Method used

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  • Method for regulating the molecular structure of heavy oil
  • Method for regulating the molecular structure of heavy oil
  • Method for regulating the molecular structure of heavy oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The raw material of heavy oil is oil sand bitumen, and its basic properties are shown in Table 1. The mesoporous MCM-41 molecular sieve catalyst was purchased from the market.

[0036] Table 1 Basic properties of raw oil sand bitumen and FCC products

[0037]

[0038] Reaction process: 10g of oil sand pitch, mesoporous MCM-41 molecular sieve catalyst, and 30g of benzene were placed in an autoclave with a volume of 100ml. through N 2 After purging, the autoclave was closed and the temperature was raised at a rate of 15 °C / min. After reaching the cracking temperature of 390°C, maintain it for 0.5 min, and then quickly cool down the reaction system.

[0039] Product analysis: Four-component separation is based on the standard SY / T 5119-2016; the dynamic viscosity of the product is measured on the Advanced Rheology Expand System (TA Instruments); the number average molecular weight of the product is based on the Sinopec standard SH / T 0583-94 measurement; the distill...

Embodiment 2

[0045] The heavy oil raw materials are Changling reduced residue, Qingdao reduced residue and Tahe normal residue, and their basic properties are shown in Table 2. The catalyst is a mesoporous ZSM-5 molecular sieve, and the preparation method refers to "Preparation and catalytic application of ZSM-5 zeolite molecular sieve with mesoporous structure" (Jilin University Journal Science Edition, 2018, 56, 1561).

[0046] Table 2 Basic Properties of Atmospheric and Vacuum Residue Raw Materials and FCC Products

[0047]

[0048] Reaction process: After preheating the raw material residue and benzene, they pass through a fixed-bed reactor filled with mesoporous ZSM-5 molecular sieves. The mass ratio of raw material benzene and residual oil is 2:1 (wt), and the temperature when entering the catalyst bed is 370°C. The temperature of the catalyst bed was kept at 370° C., and the residence time of the material in the catalyst bed was 5 minutes. The density of supercritical benzene i...

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Abstract

The invention relates to a method for adjusting and controlling the heavy oil molecular structure. Supercritical benzene in a specific thermodynamics state and a mesoporous molecular sieve are introduced into the shallow catalytic cracking of heavy oil. By dissolving the heavy oil in the supercritical benzene in the specific thermodynamics state, the diffusion coefficient D of heavy oil moleculescan be easily improved; by means of the mesoporous molecular sieve, the adverse effects of diffusion blocking factors F(dr / d) on the diffusion of the heavy oil molecules in catalyst ducts are furtherrelieved. Thus, the diffusion cover of the carbon positive ion mechanism catalytic cracking of the heavy oil is converted into reaction kinetics control which can be smoothly conducted at a low temperature. Through the measures, the breakage of aromatic alkyl side chains or links of heavy oil molecular structure adjusting and controlling is more rapidly decided, cracking is controlled at a properdepth on the basis of the optimization of the technological conditions. Moreover, thick cyclization is restrained and no coke is generated. The processed product can be used for subsequent catalytic hydrogenation or transport property improvement.

Description

technical field [0001] The invention relates to the technical field of heavy oil, in particular to the treatment of heavy oil, in particular to a method for regulating the molecular structure of heavy oil. Background technique [0002] Heavy oil including extra heavy crude oil, oil sand bitumen, vacuum residue, atmospheric residue, and catalytic cracking slurry has the following properties: figure 1 Similar molecular structure features are shown: 1) there is a complex fused ring center composed of aromatic rings, cycloalkane rings and heterocycles; 2) there are alkyl side chains or links in the fused ring center. Such as figure 1 The structural features shown make the average scale of heavy oil molecules (d r ) are generally large and the viscosity (μ) is extremely high. [0003] The structural characteristics of heavy oil molecules bring serious problems to heavy oil transportation and catalytic processing. For heavy oil transportation, it has clear index requirements f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G11/05
CPCC10G11/05
Inventor 袁佩青李艳
Owner EAST CHINA UNIV OF SCI & TECH
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