Catalytic cracking aid capable of promoting yield increase of propylene, and preparation method thereof

Abstract

The invention discloses a catalytic cracking aid capable of promoting yield increase of propylene, and a preparation method thereof. The catalytic cracking aid comprises, on the basis of dry base weight, 10 to 75 wt% of an IMF-structure molecular sieve containing phosphorus and loading metal in terms of the dry base weight, 3 to 40 wt% of a phosphorus-aluminum inorganic binder in terms of the drybase weight, 1 to 30 wt% of other inorganic binder in terms of oxide, 0 to 60 wt% of second clay in terms of the dry base weight and 0.5 to 15 wt% of a metallic additive in terms of oxide, wherein themetallic additive is at least one selected from a group consisting of group-VIII metal, manganese, zinc and gallium. The aid provided by the invention can effectively improve propylene yield and propylene selectivity when applied to catalytic cracking.

Description

technical field

[0001] The disclosure relates to a catalytic cracking additive for increasing propylene production and a preparation method thereof. Background technique

[0002] For a long time, ethylene, propylene and butene have been the basic organic chemical raw materials for synthetic resin, synthetic fiber and synthetic rubber, among which propylene is an important raw material for the manufacture of petrochemical products after ethylene. At present, the largest source of propylene at home and abroad is the main by-product of thermal cracking to produce ethylene. The second largest source of propylene is almost all from FCC units, which provide about 30% of the demand. In the United States, FCC units provide petrochemical products for propylene. About half of the demand.

[0003] Due to the rapidly growing demand for polypropylene, the demand for propylene in the petrochemical industry is faster than that for ethylene, and the construction of ethylene plants is limit...

Examples

Embodiment approach

[0032] A specific embodiment, based on the dry basis weight of the phosphorus-aluminum inorganic binder, the phosphorus-aluminum inorganic binder includes Al 2 o 3 15-40% by weight aluminum component, with P 2 o 5 45-80% by weight of the phosphorus component and 0-40% by weight of the first clay based on dry weight, and its P / Al weight ratio is 1.0-6.0, the pH value is 1-3.5, and the solid content is 15- 60% by weight; for example including Al 2 o 3 15-40% by weight aluminum component, with P 2 o 5 A phosphorus component of 45-80% by weight and a first clay of 1-40% by weight on a dry basis; preferably containing Al 2 o 3 15-35% by weight of the aluminum component, as P 2 o 5 50-75% by weight of the phosphorus component and 8-35% by weight of the first clay on a dry basis, the P / Al weight ratio is preferably 1.2-6.0, more preferably 2.0-5.0, and the pH is preferably 1.5 -3.0.

[0033] Another specific embodiment, based on the dry basis weight of the phosphorus-alumi...

Embodiment 1

[0082] Filter the mother liquor from the crystallized IM-5 molecular sieve (produced by Changling Catalyst Factory), wash with water, filter and dry; roast the dried molecular sieve in the air for 6 hours at a roasting temperature of 550°C to remove the templating agent therein Get the above-mentioned molecular sieve 100g (dry basis) and add in 1000g 2.4% by weight of NaOH solution, heat up to 65°C, react for 30min, cool to room temperature rapidly, filter, wash until the filtrate is neutral. Then, add 800g water to the filter cake to make a slurry, add 40g NH 4 Cl, heated to 75°C, exchanged for 1h, to Na 2 O content is lower than 0.2% by weight, filters, washes, and obtains molecular sieve filter cake; Get above-mentioned molecular sieve filter cake 50g (dry basis) and add water and be mixed with the molecular sieve slurry of solid content 10% by weight, add oxalic acid 5g in stirring, then 35g hydrochloric acid ( Mass fraction 10%) and 28g fluosilicic acid (mass fraction 3%...

Embodiment 2

[0098] Filter the mother liquor from the crystallized IM-5 molecular sieve (produced by Changling Catalyst Factory), wash with water, filter and dry; roast the above-mentioned dried molecular sieve in air for 8 hours at a roasting temperature of 550°C to remove the templating agent therein Take 100g (dry basis) of the above-mentioned molecular sieve and add it to 1500g 2.3% by weight of NaOH solution, heat up to 60°C, react for 45min, cool to room temperature rapidly, filter, and wash until the filtrate is neutral. Then, add 800g water to the filter cake to make a slurry, add 40g NH 4 Cl, heated to 75°C, exchanged for 1h, to Na 2 O content is lower than 0.2% by weight, filters, washes, obtains molecular sieve filter cake; Get above-mentioned molecular sieve filter cake 50g (dry basis) and add water and be mixed with the molecular sieve slurry of solid content 10% by weight, add citric acid 4g in stirring, then 10g sulfuric acid ( Mass fraction 10%) and 45g fluosilicic acid (m...

technical field

[0001] The disclosure relates to a catalytic cracking additive for increasing propylene production and a preparation method thereof. Background technique

[0002] For a long time, ethylene, propylene and butene have been the basic organic chemical raw materials for synthetic resin, synthetic fiber and synthetic rubber, among which propylene is an important raw material for the manufacture of petrochemical products after ethylene. At present, the largest source of propylene at home and abroad is the main by-product of thermal cracking to produce ethylene. The second largest source of propylene is almost all from FCC units, which provide about 30% of the demand. In the United States, FCC units provide petrochemical products for propylene. About half of the demand.

[0003] Due to the rapidly growing demand for polypropylene, the demand for propylene in the petrochemical industry is faster than that for ethylene, and the construction of ethylene plants is limit...

Examples

Embodiment approach

[0032] A specific embodiment, based on the dry basis weight of the phosphorus-aluminum inorganic binder, the phosphorus-aluminum inorganic binder includes Al 2 o 3 15-40% by weight aluminum component, with P 2 o 5 45-80% by weight of the phosphorus component and 0-40% by weight of the first clay based on dry weight, and its P / Al weight ratio is 1.0-6.0, the pH value is 1-3.5, and the solid content is 15- 60% by weight; for example including Al 2 o 3 15-40% by weight aluminum component, with P 2 o 5 A phosphorus component of 45-80% by weight and a first clay of 1-40% by weight on a dry basis; preferably containing Al 2 o 3 15-35% by weight of the aluminum component, as P 2 o 5 50-75% by weight of the phosphorus component and 8-35% by weight of the first clay on a dry basis, the P / Al weight ratio is preferably 1.2-6.0, more preferably 2.0-5.0, and the pH is preferably 1.5 -3.0.

[0033] Another specific embodiment, based on the dry basis weight of the phosphorus-alumi...

Embodiment 1

[0082] Filter the mother liquor from the crystallized IM-5 molecular sieve (produced by Changling Catalyst Factory), wash with water, filter and dry; roast the dried molecular sieve in the air for 6 hours at a roasting temperature of 550°C to remove the templating agent therein Get the above-mentioned molecular sieve 100g (dry basis) and add in 1000g 2.4% by weight of NaOH solution, heat up to 65°C, react for 30min, cool to room temperature rapidly, filter, wash until the filtrate is neutral. Then, add 800g water to the filter cake to make a slurry, add 40g NH 4 Cl, heated to 75°C, exchanged for 1h, to Na 2 O content is lower than 0.2% by weight, filters, washes, and obtains molecular sieve filter cake; Get above-mentioned molecular sieve filter cake 50g (dry basis) and add water and be mixed with the molecular sieve slurry of solid content 10% by weight, add oxalic acid 5g in stirring, then 35g hydrochloric acid ( Mass fraction 10%) and 28g fluosilicic acid (mass fraction 3%...

Embodiment 2

[0098] Filter the mother liquor from the crystallized IM-5 molecular sieve (produced by Changling Catalyst Factory), wash with water, filter and dry; roast the above-mentioned dried molecular sieve in air for 8 hours at a roasting temperature of 550°C to remove the templating agent therein Take 100g (dry basis) of the above-mentioned molecular sieve and add it to 1500g 2.3% by weight of NaOH solution, heat up to 60°C, react for 45min, cool to room temperature rapidly, filter, and wash until the filtrate is neutral. Then, add 800g water to the filter cake to make a slurry, add 40g NH 4 Cl, heated to 75°C, exchanged for 1h, to Na 2 O content is lower than 0.2% by weight, filters, washes, obtains molecular sieve filter cake; Get above-mentioned molecular sieve filter cake 50g (dry basis) and add water and be mixed with the molecular sieve slurry of solid content 10% by weight, add citric acid 4g in stirring, then 10g sulfuric acid ( Mass fraction 10%) and 45g fluosilicic acid (m...

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