CN209923225U - System for preparing aldehyde through olefin hydroformylation - Google Patents
System for preparing aldehyde through olefin hydroformylation Download PDFInfo
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- CN209923225U CN209923225U CN201920342442.2U CN201920342442U CN209923225U CN 209923225 U CN209923225 U CN 209923225U CN 201920342442 U CN201920342442 U CN 201920342442U CN 209923225 U CN209923225 U CN 209923225U
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Abstract
The utility model discloses a system for preparing aldehyde by olefin hydroformylation, which comprises a hydroformylation reactor (201), an evaporator (202), a rectifying tower (209) and a storage tank (204) which are connected in sequence; the reactor (201) comprises an alkane feeding pipeline (11), a reaction material discharging port is arranged at the bottom of the reactor, and the reactor is connected with an evaporator through a pipeline; the bottom of the evaporator (202) is provided with a catalyst solution discharge port which is connected with a cooler (206) through a pipeline, the cooler is connected with a catalyst solution pump (207) through a pipeline, and the catalyst solution pump is connected with a catalyst feeding pipeline; the upper part of the evaporator (202) is provided with a reactant extraction port which is connected with a condenser (203) through a pipeline, and the condenser is connected with a rectifying tower (209) through a pipeline; the lower part of the rectifying tower is provided with an aldehyde extraction pipeline (12), and the aldehyde extraction pipeline is connected with a storage tank (204).
Description
Technical Field
The utility model belongs to aldehyde preparation facilities field, concretely relates to system for aldehyde is prepared in olefin hydroformylation.
Background
Hydroformylation is a well-known process in the chemical industry in which an olefin is reacted with carbon monoxide and hydrogen in the presence of a catalyst to form aldehydes and alcohols having one carbon atom more than the starting olefin. The olefin hydroformylation reaction can conveniently and effectively convert cheap and easily-obtained basic chemical raw materials such as olefin and the like into a plurality of important chemical products such as aldehydes and the like, and is a homogeneous catalysis process with the largest production scale so far.
Olefin hydroformylation reaction mostly focuses on the development and research of catalyst systems, and the technology is becoming mature. In the prior art, in the document CN104557488A, polar N, N-dimethylcyclohexylamine (CyNMe2) is used as a solvent for generating isovaleraldehyde by the hydroformylation of isobutene, the product yield is 70 percent at most, and the yield is low. In the document CN102260147A, imidazole, bisimidazole, quaternary phosphonium, quaternary ammonium or guanidine ionic liquid is used as a solvent for hydroformylation, but the solubility of triphenylphosphine ligand in the ionic liquid solvent is very low, and the triphenylphosphine can be completely dissolved by adding a product aldehyde compound, so that the rhodium catalyst, triphenylphosphine and aldehyde can form a completely miscible homogeneous solution.
Although the prior art has many processes for preparing aldehydes by olefin hydroformylation, the studied hydroformylation device is concentrated on the hydroformylation reactor, and a system for preparing aldehydes by olefin hydroformylation is lacked, and the prior art device has the technical problems of narrow normal-to-normal ratio of product aldehydes, less isomeric aldehyde products, non-uniform reaction temperature and the like, thereby affecting the product quality.
SUMMERY OF THE UTILITY MODEL
In view of the technical problems in the prior art, the utility model aims to disclose a system for preparing aldehyde by olefin hydroformylation. The utility model discloses a system for preparation of aldehyde is hydroformylated to olefin has set up the alkane pipeline, adds the very low alkane of polarity to olefin hydroformylation reaction system, as one of solvent or solvent. The utility model discloses it has been discovered unexpectedly that adding the alkane with very low polarity broadens the normal-iso ratio of the aldehyde product, and obtains the isomeric aldehyde product with the same amount of normal aldehyde; meanwhile, the added alkane can also make the reaction temperature more uniform and promote the reaction.
The utility model discloses a system for preparation of aldehyde by olefin hydroformylation, its technical scheme as follows.
A system for preparing aldehyde by olefin hydroformylation comprises a hydroformylation reactor 201, an evaporator 202, a rectifying tower 209 and a storage tank 204 which are connected in sequence;
wherein the reactor 201 comprises an olefin feed line 1, a syngas feed line 2, an alkane feed line 11, and a catalyst feed line 9; wherein, the bottom of the reactor 201 is provided with a reaction material outlet which is connected with an evaporator 202 through a pipeline 3; the top of the reactor 201 is provided with an air outlet which is connected with a tail gas treatment system through a pipeline 10;
the bottom of the evaporator 202 is provided with a catalyst solution outlet, and is connected with a cooler 206 through a pipeline 7, the cooler 206 is connected with a catalyst solution pump 207 through a pipeline, and the catalyst solution pump 207 is connected with a catalyst feeding pipeline 9; the upper part of the evaporator 202 is provided with a reactant extraction port which is connected with a condenser 203 through a pipeline 5, and the condenser 203 is connected with a rectifying tower 209 through a pipeline 6;
the upper part of the rectifying tower is provided with an alkane extraction pipeline 13, the lower part of the rectifying tower is provided with an aldehyde extraction pipeline 12, and the aldehyde extraction pipeline 12 is connected with a storage tank 204.
Preferably, the reactor 201 is a pressure-resistant stirred tank reactor.
Preferably, the evaporator 202 is a rotary falling film evaporator.
Preferably, the rectifying tower 209 is an extractive rectifying tower.
The utility model discloses profitable effect has been obtained.
The utility model discloses to the technical problem who exists among the prior art, provide a system of alkene hydroformylation preparation aldehyde, the utility model discloses set up alkane feed line on the reactor, add the very low alkane of polarity to alkene hydroformylation reaction system, as one of solvent or solvent. The utility model discloses it is very low alkane of polarity to discover to add to have widened the normal iso ratio of product aldehyde unexpectedly, obtain the isomeric aldehyde product equivalent to normal aldehyde quantity; meanwhile, the added alkane can also make the reaction temperature more uniform and promote the reaction.
Drawings
FIG. 1 is a system for preparing aldehydes by hydroformylation of olefins according to the present invention.
In fig. 1, corresponding reference numerals indicate parts: 1 is an olefin feeding pipeline, 2 is a synthesis gas feeding pipeline, 11 is an alkane feeding pipeline, 2, 3, 4, 5, 6, 7, 8 and 10 are all component connecting pipelines, 12 is an aldehyde production pipeline, and 13 is an alkane production pipeline; 201 is a hydroformylation reactor 201, 202 is an evaporator, 203 is a condenser, 204 is a storage tank, 205, 207 are pumps, 206 is a cooler, 208 is a gas phase product condenser, and 209 is a rectifying tower.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1
A system for preparing aldehyde by olefin hydroformylation comprises a hydroformylation reactor 201, an evaporator 202, a rectifying tower 209 and a storage tank 204 which are connected in sequence;
wherein the reactor 201 is a pressure-resistant stirred tank reactor, and comprises an olefin feeding pipeline 1, a synthesis gas feeding pipeline 2, an alkane feeding pipeline 11 and a catalyst feeding pipeline 9; wherein, the bottom of the reactor 201 is provided with a reaction material outlet which is connected with an evaporator 202 through a pipeline 3; the top of the reactor 201 is provided with an air outlet which is connected with a tail gas treatment system through a pipeline 10;
the evaporator 202 is a rotary falling-film evaporator, the bottom of the evaporator is provided with a catalyst solution discharge hole and is connected with a cooler 206 through a pipeline 7, the cooler 206 is connected with a catalyst solution pump 207 through a pipeline, and the catalyst solution pump 207 is connected with a catalyst feeding pipeline 9; the upper part of the evaporator 202 is provided with a reactant extraction port which is connected with a condenser 203 through a pipeline 5, and the condenser 203 is connected with a rectifying tower 209 through a pipeline 6;
the upper part of the rectifying tower is provided with an alkane extraction pipeline 13, the lower part of the rectifying tower is provided with an aldehyde extraction pipeline 12, and the aldehyde extraction pipeline 12 is connected with a storage tank 204.
Example 1 in carrying out the olefin formylation reaction, an olefin selected from a propylene butene mixture (propylene: butene ═ 3: 4) was fed at a rate of 64g/h through the olefin feed line 1 to the reactor 201 separately from the synthesis gas via the synthesis gas feed line 2 and the alkane via the alkane feed line 11; the reactor was a 500ml pressure-resistant stirred autoclave, the internal pressure of the reactor was controlled to 2.2MPa by a gas phase outlet back pressure valve (not shown in FIG. 1), and the reactor temperature was controlled to 97 ℃ by an oil bath (not shown in FIG. 1); the catalyst solution from pump 207 enters the bottom of reactor 201 via line 9 via a footer; the concentration of the liquid phase catalyst in the reactor 201 is 200ppm calculated by metal rhodium, and triphenylphosphine ligand with the mass content of about 10% is also contained in the solution; raw material olefin and synthesis gas react under the action of a catalyst solution, a reaction gas-phase product passes through a condenser 208, a product aldehyde in the reaction gas-phase product is condensed and reflows to a reactor 201, and the residual non-condensable gas enters a tail gas treatment system through a pipeline 10;
the liquid reaction product was sent via line 3 via pump 205 to a rotary falling-film evaporator 202 of 0.15m diameter, the evaporator 202 pressure being controlled at 0.15MPa by means of a back-pressure valve (not shown in FIG. 1) and the temperature being controlled at 120 ℃ by means of an oil bath (not shown in FIG. 1); the product aldehyde and unreacted alkane are extracted from the top of the evaporator 202, condensed by the condenser 203 and then enter the rectifying tower 209 through the pipeline 6; the catalyst solution is at the bottom of the evaporator 202, is cooled by a cooler 206 via a line 7, and is then transferred to the reactor 201 by a pump 207; in the rectifying tower 209, the product aldehyde is separated from the unreacted alkane, the product aldehyde is extracted from the bottom of the tower and enters the storage tank 204 through the pipeline 12, and the unreacted alkane is extracted from the top of the tower. And (3) metering and analyzing the product in the storage tank 204, wherein the total aldehyde yield is 0.97mol/h, the total conversion rate of the olefin is up to 97 percent by calculation, and the product aldehyde normal-to-iso ratio is 1.5: 1 by chromatographic analysis.
Claims (4)
1. A system for preparing aldehyde by olefin hydroformylation is characterized by comprising a hydroformylation reactor (201), an evaporator (202), a rectifying tower (209) and a storage tank (204) which are connected in sequence;
wherein the reactor (201) comprises an olefin feed line (1), a synthesis gas feed line (2), an alkane feed line (11) and a catalyst feed line (9); wherein, the bottom of the reactor is provided with a reaction material outlet which is connected with an evaporator through a pipeline; the top of the reactor is provided with an air outlet which is connected with a tail gas treatment system through a pipeline;
the bottom of the evaporator (202) is provided with a catalyst solution discharge port which is connected with a cooler (206) through a pipeline, the cooler is connected with a catalyst solution pump (207) through a pipeline, and the catalyst solution pump is connected with a catalyst feeding pipeline; the upper part of the evaporator (202) is provided with a reactant extraction port which is connected with a condenser (203) through a pipeline, and the condenser is connected with a rectifying tower (209) through a pipeline;
the upper part of the rectifying tower is provided with an alkane extraction pipeline (13), the lower part of the rectifying tower is provided with an aldehyde extraction pipeline (12), and the aldehyde extraction pipeline is connected with a storage tank (204).
2. The system for preparing aldehyde by hydroformylation of olefin as claimed in claim 1, wherein the reactor is a pressure-resistant stirred tank reactor.
3. The system for preparing aldehyde by hydroformylation of olefin according to claim 1 or 2, wherein the evaporator is a rotary falling film evaporator.
4. The system for preparing aldehyde by hydroformylation of olefin according to claim 1 or 2, wherein the rectifying column is an extractive rectifying column.
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| CN201920342442.2U CN209923225U (en) | 2019-03-04 | 2019-03-04 | System for preparing aldehyde through olefin hydroformylation |
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| CN201920342442.2U CN209923225U (en) | 2019-03-04 | 2019-03-04 | System for preparing aldehyde through olefin hydroformylation |
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