Method for preparing BTX and co-producing tetramethylbenzene from C9<+> heavy aromatic hydrocarbons
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A technology of mesitylene and heavy aromatics, applied in the field of aromatics chemical production, can solve the problems of high added value of products, low conversion rate of raw materials, large output of dry gas, etc., and achieve high yield of target products, high conversion rate of raw materials, dry gas The effect of low gas yield
Inactive Publication Date: 2017-11-21
CNOOC TIANJIN CHEM RES & DESIGN INST +1
View PDF4 Cites 4 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0006] The present invention mainly solves the current C 9 + The processing technology of heavy aromatics requires hydrogen operation, high hydrogen consumption, low conversion rate of raw materials, large dry gas output, and low added value of products. BTX and homogeneous Tetramethylbenzene, which has the advantages of high conversion rate of raw materials, high yield of target products, and high added value of products
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0030] Take C from a refinery 9 + Heavy aromatics as raw material, load 2% La after 500℃ hydrothermal treatment 2 O 3 Nano ZSM-5 molecular sieve (SiO 2 / Al 2 O 3 The molar ratio is 30) as the catalyst, the reaction temperature is 460℃, the pressure is 0.5MPa, and the raw material mass space velocity is 1.0h -1 Under the conditions of the catalytic cracking reaction, C 9 + The properties of the raw materials and the composition of the liquid phase products after cracking are shown in Table 1.
Embodiment 2
[0032] Catalytic cracking catalyst adopts 450℃ hydrothermal treatment to load 3% La 2 O 3 Nano ZSM-5 molecular sieve (SiO 2 / Al 2 O 3 The molar ratio is 30) catalyst, the reaction conditions are: temperature 450℃, pressure 0.2MPa, raw material mass space velocity 0.5h -1 .
[0033] Alkylation reactor is filled with 2% P 2 O 5 Modified ZSM-5 / MCM-22 composite molecular sieve (the mass ratio of ZSM-5 molecular sieve to MCM-22 molecular sieve is 2:1) catalyst, the reaction conditions are: reaction temperature 360℃, pressure 0.1MPa, raw material mass space velocity 1.0h -1 , The molar ratio of trimethylbenzene to methanol is 1:1.
[0034] After the above catalytic cracking, alkylation and separation processes, the yield of each product is shown in Table 2.
Embodiment 3
[0036] Catalytic cracking catalyst adopts 500℃ hydrothermal treatment to load 2% La 2 O 3 Nano ZSM-5 molecular sieve (SiO 2 / Al 2 O 3 The molar ratio is 30) the catalyst, the reaction conditions are: temperature 500℃, pressure 0.3MPa, raw material mass space velocity 1.0h -1 .
[0037] Alkylation reactor is filled with 3% P 2 O 5 Modified ZSM-5 / MCM-22 composite molecular sieve (the mass ratio of ZSM-5 molecular sieve to MCM-22 molecular sieve is 2:1) catalyst, the reaction conditions are: reaction temperature 420℃, pressure 0.2MPa, raw material mass space velocity 1.5h -1 , The molar ratio of trimethylbenzene to methanol is 2:1.
[0038] After the above catalytic cracking, alkylation and separation processes, the yield of each product is shown in Table 2.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
Abstract
The invention relates to a method for preparing BTX and co-producing tetramethylbenzene from C9<+> heavy aromatic hydrocarbons. The method comprises: carrying out catalytic cracking conversion on C9<+> heavy aromatic hydrocarbons to obtain a first-stage hydrocarbon mixing product using BTX and trimethylbenzene as main components, and separating respectively with an ethane removing tower, a butane removing tower, a hexane removing tower, a BTX removing tower and a trimethylbenzene removing tower to obtain dry gas, liquefied gas, C5-C6 non-aromatic hydrocarbons, BTX, trimethylbenzene and C10<+> heavy aromatic hydrocarbons, wherein the dry gas, the liquefied gas, the C5-C6 non-aromatic hydrocarbons and the BTX are adopted as products; carrying out a reaction on the trimethylbenzene and a certain amount of methanol to obtain a tetramethylbenzene-rich second-stage mixing product, and separating the products to obtain dry gas, wastewater and liquid-state hydrocarbons, wherein the liquid-state hydrocarbon products return to the ethane removing tower so as to be separated; and carrying out crystallization separation on the C10<+> heavy aromatic hydrocarbons to obtain tetramethylbenzene and a heavy component residue liquid, wherein the tetramethylbenzene and the part of the heavy component residue liquid are adopted as the product, and the remaining heavy component residue liquid return to a catalytic cracking reactor. According to the present invention, with the method, the moving bed non-hydrogen cracking and the tetramethylbenzene preparation using trimethylbenzene alkylation are compounded, such that the BTX is produced at a maximum while the high added value tetramethylbenzene can be co-produced.
Description
Technical field [0001] The invention belongs to the technical field of aromatics chemical production, and specifically relates to a C 9 + Method for preparing BTX and co-producing mesitylene from heavy aromatics. Background technique [0002] BTX (benzene, toluene, xylene) is an important primary organic raw material, and its output and scale are second only to ethylene and propylene. At present, my country has become the world's largest producer, consumer and importer of BTX. In the future, with the further growth of the national economy, my country's demand for BTX will further increase. [0003] BTX is mainly derived from catalytic reforming. While catalytic reforming produces BTX, it will produce a part of C by-product. 9 + Heavy aromatics, C 9 + Heavy aromatics account for approximately 20% of reforming processing capacity. According to statistics, the current domestic reforming capacity is 120 million tons / year, C 9 + The production of heavy aromatics is approximately 25 mi...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more