CN104888789B - Catalyst for preparing 1,4-cyclohexanedimethanol - Google Patents
Catalyst for preparing 1,4-cyclohexanedimethanol Download PDFInfo
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- CN104888789B CN104888789B CN201510260820.9A CN201510260820A CN104888789B CN 104888789 B CN104888789 B CN 104888789B CN 201510260820 A CN201510260820 A CN 201510260820A CN 104888789 B CN104888789 B CN 104888789B
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Abstract
The invention discloses a catalyst for preparing 1,4-cyclohexanedimethanol. According to the invention, copper, zinc and aluminium are used as active ingredients and Mg, Ba, Mn and the like are used as auxiliary agents to prepare the catalyst by methods of fractional precipitation and dynamic crystallization. The catalyst prepared by the method has high specific surface area and uniform particle size, and has high activity and high selectivity when used in 1,4-cyclohexanedicarboxylic acid diformate hydrogenation for preparation of 1,4-cyclohexanedimethanol. In addition, trans-cis ratio is adjustable.
Description
Technical field
The present invention relates to a kind of catalyst, particularly a kind of anti-along than adjustable 1,4-CHDM for preparing
Catalyst, belongs to the technical field of catalytic hydrogenation.
Background technology
1,4-CHDM (CHDM), white waxy solid.There are two kinds of different structural formulas, it is trans and cis, melt
43 DEG C (cis) of point, 70 DEG C (trans), 286 DEG C of boiling point.Relative density 1.150 (20/4 DEG C).160 DEG C of sublimation temperature, with water, alcohol
It is miscible, ketone is dissolved in, it is practically insoluble in aliphatic hydrocarbon, ether.
1,4-CHDM is the upgraded product of the production polyester for substituting ethylene glycol or other polyhydric alcohol
Raw material, has more preferable heat stability and chemical stability good, without phenyl ring, nothing by materials such as its high-performance polyesters for synthesizing
Poison, is a kind of environmental protection plasticizer and green chemical.The high polymer fusing point 260 of cis -1,4-CHDM synthesis
~267 DEG C, anti-form-1,4- cyclohexanedimethanols synthesis high polymer 315~320 DEG C of fusing point, combination property show it is trans-
CHDM performances are better than cis-CHDM.Presently commercially available CHDM is that suitable, back mixing is fit, anti-along than being usually 1.0~2.5:1.
At present, industrial production 1,4-CHDM is hydrogenated with through two steps by raw material of dimethyl terephthalate (DMT)
Method production is obtained, and Yi Si Man of the U.S. is to apply for Patents earliest, and so far Yi Si Man produces work in CHDM
Skill aspect maintains the leading position.CN102795965A discloses the technique that two step method produces 1,4-CHDM, using solid
Fixed bed reacts, with dimethyl terephthalate (DMT) as raw material, a step benzene ring hydrogenation Ru/Al2O3For catalyst, condition is 140 DEG C,
4.0Mpa.Two step ester through hydrogenation are 180 DEG C with modified Cu-Cr catalyst, condition, 5.0Mpa.1,4-CHDM it is total
Yield is 94.3%.U.S.'s Yi Si Man patent US6600080 prepares 1,4-CHDM using a step hydrogenation method, with
Terephthalyl alcohol is raw material, and using 5%Ru/C catalyst, condition is 100 DEG C, 4.9Mpa, but 1,4-CHDM
Yield is 76%.One step hydrogenation method is high to equipment requirements, and product purity is low, and later separation is more complicated.Only describe in patent
The yield of product 1,4-CHDM, but and trans, cis-isomer composition in undeclared product because it is suitable,
Both crystal structures anti-are different, so as to the melt temperature and density of polyester are also different.
The content of the invention
It is an object of the invention to provide a kind of catalyst, the catalysis can be used to adjust anti-in 1,4-CHDM
The ratio of formula -1,4-CHDM, so as to improve the performance of product.
Realizing the technical scheme of the object of the invention is：A kind of catalyst for preparing 1,4-CHDM, it is described
Catalyst by following steps prepare：
(1) zinc nitrate, aluminum nitrate are dissolved in the water containing 1~2wt% Polyethylene Glycol, are configured to solution A；By nitric acid
Copper and promoter metal nitrate are configured to B solution；Precipitant is configured to into C solution；
(2) solution A and C solution are poured in colloid mill simultaneously, high-speed stirred 2-10min obtains catalyst precursor 1；
(3) B solution is slowly added to in catalyst precursor 1, high-speed stirred 10-30min obtains catalyst precursor 2；
(4) catalyst precursor 2 is washed to without Cl-, being transferred in rotation crystallization instrument carries out crystallization, after natural cooling simultaneously
Washing, obtains catalyst precursor 3；
(5) catalyst precursor 3 is dried into the roasting at 200~700 DEG C DEG C；
(6) it is standby after tabletting screening.
In step (1), described Polyethylene Glycol adopts Macrogol 2000~12000；Described promoter metal nitric acid
Salt is one or more in magnesium nitrate, manganese nitrate and barium nitrate；Precipitant is in sodium hydroxide, sodium carbonate and sodium bicarbonate
One or more, precipitant is 1.2~1.5 with the mol ratio of each metal nitrate summation:1.
In step (2) and (3), the rotating speed of colloid mill high-speed stirred is 2000-5000r/min.
In step (4), the condition of crystallization is：Rotating speed 30-100r/min, temperature 50-80 DEG C, crystallization time 12-24h.
In step (5), baking temperature is 80~120 DEG C, and drying time is 2~24h；Roasting time is 2h~24h.
Anti-form-1,4- hexamethylene are adjusted when being applied to prepare 1,4-CHDM by catalyst prepared by said method
The ratio of dimethanol, described catalyst faces before the use hydrogen reduction, with 10 DEG C/min ramps to 220 DEG C, keeps also
Former 2-10h.
Compared with prior art, beneficial effects of the present invention are：(1) composition by change CuZnAl catalyst and preparation
Method, the specific surface area of catalyst of preparation is big, and active constituent is evenly distributed, and aperture even.(2) the CuZnAl catalyst application
In 1,4-CHDM is prepared, feed stock conversion is high, and target product selectivity is good, while anti-form-1 can be adjusted, 4- rings
The ratio of hexane dimethanol, so as to improve the performance of product.
Specific embodiment
In following embodiments, using the analytical reactions thing conversion ratios of gas chromatograph Agilent 7820, yield, selectivity；
The full-automatic specific surface area produced using Beijing Jin Aipu Science and Technology Ltd.s and Porosimetry V-Sorb 2800P are determined and urged
Agent specific surface area, pore volume and aperture.
Evaluate the catalyst of the present invention is carried out in 50ml high pressure fixed beds.In the reactor constant temperature portion in portion's adds a certain amount of
Catalyst, upper-lower section filled with quartz sand.After with hydrogen exchange device, catalyst is reduced.The system for the treatment of reaches setting
Temperature and pressure when, the boosting of raw material Jing pumps mix with hydrogen, and into hydrogenation reactor, as needed regulation reaction condition is (such as
Pressure, temperature, hydrogen-oil ratio etc.).Product Jing heat exchangers are cooled down, and enter high-pressure separator gas-liquid separation, the high pressure hydrogen Jing for isolating
Recycle compressor is sent into reactor cycles and is used, and the highly pressurised liquid containing a small amount of gas enters low pressure separator further carries out gas-liquid point
From, to isolate a gas part and discharge response system, a part enters on-line chromatograph and analyzes its composition；Separate the liquid after gas to enter
Fractional distillation refining plant, carries out refinement treatment, and the qualified products of acquisition enter products pot.
Embodiment 1
According to Cu contents 40wt% in catalyst, Zn contents 20wt%, Al content 40wt% accurately measure corresponding copper nitrate,
Zinc nitrate, aluminum nitrate.2g PEG20000 heating for dissolving is weighed in deionized water, zinc nitrate, aluminum nitrate is configured to molten
Liquid A, copper nitrate is configured to solution B.The sodium bicarbonate of accurate measurement is configured to into C solution.Solution A and B solution are poured into simultaneously
In colloid mill, with 3000r/min high-speed stirred 10min, catalyst precursor 1 is obtained.B solution is slowly added into before catalyst
Body 1 is driven, 3000r/min high-speed stirred 15min obtains catalyst precursor 2, be washed with deionized washing to without Cl-After turn
In moving on to rotation crystallization instrument, rotating speed 50r/min, 80 DEG C, crystallization 12h obtains catalyst precursor 3.Presoma 3 is used into deionization
80 DEG C of vacuum drying oven is put into after water washing 2 times be dried 24h.With the ramp of 5 DEG C/min to 600 DEG C, roasting in Muffle furnace
12h.Obtain catalyst CAT-1.
Embodiment 2
According to Cu contents 50wt% in catalyst, Zn contents 25wt%, Al content 25wt% accurately measure corresponding copper nitrate,
Zinc nitrate, aluminum nitrate.2g PEG 20000 heating for dissolving is weighed in deionized water, zinc nitrate, aluminum nitrate is configured to molten
Liquid A, copper nitrate is configured to solution B.The sodium hydroxide of accurate measurement is configured to into C solution.Solution A and B solution are poured into simultaneously
In colloid mill, with 4000r/min high-speed stirred 10min, catalyst precursor 1 is obtained.B solution is slowly added into before catalyst
Body Isosorbide-5-Nitrae 000r/min high-speed stirred 20min is driven, catalyst precursor 2 is obtained, washing is washed with deionized to without after Cl- turns
In moving on to rotation crystallization instrument, rotating speed 50r/min, 80 DEG C, crystallization 16h obtains catalyst precursor 3.Presoma 3 is used into deionization
80 DEG C of vacuum drying oven is put into after water washing 2 times be dried 8h.With the ramp of 5 DEG C/min to 550 DEG C, roasting in Muffle furnace
24h.Obtain catalyst CAT-2.
Embodiment 3
A, B, C solution preparation are poured in colloid mill simultaneously with embodiment 2, solution A and B solution, with 3000r/min high-speed stirrings
5min is mixed, catalyst precursor 1 is obtained.B solution is slowly added into into catalyst precursor 1,3000r/min high-speed stirred
15min, obtains catalyst precursor 2.The other the same as in Example 2, obtains catalyst CAT-3.
Embodiment 4
In the solution B of embodiment 2, add auxiliary agent magnesium nitrate, wherein, content of magnesium replaces 2% copper content.A, B, C solution
Preparation is poured in colloid mill simultaneously with embodiment 2, solution A and B solution, with 5000r/min high-speed stirred 5min, obtains catalyst
Presoma 1.B solution is slowly added into into catalyst precursor 1,5000r/min high-speed stirred 10min obtains complex catalyst precursor
Body 2.The other the same as in Example 2, obtains catalyst CAT-4.
Embodiment 5
In example 2, change dynamic crystallization condition be rotating speed 30r/min, 80 DEG C, crystallization 24h, before obtaining catalyst
Drive body 3.80 DEG C of vacuum drying oven is put into after presoma 3 is washed with deionized into 2 times and is dried 12h.With 8 DEG C/min in Muffle furnace
Ramp to 650 DEG C, roasting 8h.Obtain catalyst CAT-5.
Embodiment 6
In example 2, change dynamic crystallization condition be rotating speed 80r/min, 50 DEG C, crystallization 18h, before obtaining catalyst
Drive body 3.80 DEG C of vacuum drying oven is put into after presoma 3 is washed with deionized into 2 times and is dried 12h.With 6 DEG C/min in Muffle furnace
Ramp to 650 DEG C, roasting 12h.Obtain catalyst CAT-6.
Comparative example 1
Weigh quality copper nitrate same as Example 2, zinc nitrate, aluminum nitrate and be configured to solution A.Weigh quality and implement
The identical sodium hydroxide of example 2 is configured to B solution.A, B are added in 80 DEG C of deionized waters with stirring simultaneously, 15min is reacted
Post curing 8h.With pure water washing to without Cl-, 120 DEG C are dried 12h.80 DEG C of vacuum drying oven is dried 24h.With 5 in Muffle furnace
DEG C/ramp to 600 DEG C of min, catalyst PAT-1 is obtained after roasting 8h.
Comparative example 2
Weigh quality copper nitrate same as Example 2, zinc nitrate, aluminum nitrate and be configured to solution A.Weigh quality and implement
The identical sodium hydroxide of example 2 is configured to B solution.A, B are added in 80 DEG C of deionized waters with stirring simultaneously, 15min is reacted
Post curing 8h.Washing is washed with deionized to without Cl-After be transferred to rotation crystallization instrument in, rotating speed 40r/min, 80 DEG C, crystallization
12h, obtains catalyst precursor.80 DEG C of vacuum drying oven is put into after presoma is washed with deionized into 2 times and is dried 24h.Horse
Not with the ramp of 5 DEG C/min to 600 DEG C, roasting 12h in stove.Obtain catalyst PAT-2.
Comparative example 3
A, B, C solution preparation are poured in colloid mill simultaneously with embodiment 2, solution A and B solution, with 4000r/min high-speed stirrings
5min is mixed, catalyst precursor 1 is obtained.B solution is slowly added into into catalyst precursor Isosorbide-5-Nitrae 000r/min high-speed stirred
15min, obtains catalyst precursor 2.80 DEG C of vacuum drying oven is put into after being washed with deionized 2 times after the ripening 8h of presoma 2
It is dried 24h.With the ramp of 5 DEG C/min to 600 DEG C, roasting 12h in Muffle furnace.Obtain catalyst PAT-3.
Above-mentioned catalyst is used for into DMCD Hydrogenations for CHDM reactions, activity is carried out to it using 50ml fixed beds and is commented
Valency, the results are shown in Table 1.
The different catalysts conversion ratio of table 1, selectivity and it is anti-along than
Claims (5)
1. a kind of catalyst for preparing 1,4-CHDM, it is characterised in that described catalyst is by following step
It is rapid to prepare：
(1) zinc nitrate, aluminum nitrate are dissolved in the water containing 1 ~ 2wt% Polyethylene Glycol, are configured to solution A；By copper nitrate and
Promoter metal nitrate is configured to B solution；Precipitant is configured to into C solution；
(2) solution A and C solution are poured in colloid mill simultaneously, high-speed stirred 2-10min obtains catalyst precursor 1；
(3) B solution is slowly added to in catalyst precursor 1, high-speed stirred 10-30min obtains catalyst precursor 2；
(4) catalyst precursor 2 is washed to without Cl-, being transferred in rotation crystallization instrument carries out crystallization, after natural cooling and washs,
Obtain catalyst precursor 3；
(5) catalyst precursor 3 is dried and is obtained after roasting at 200 ~ 700 DEG C.
2. it is used to as claimed in claim 1 prepare the catalyst of 1,4-CHDM, it is characterised in that step (1)
In, Polyethylene Glycol adopts Macrogol 2000 ~ 12000；Promoter metal nitrate is in magnesium nitrate, manganese nitrate and barium nitrate
Plant or several；Precipitant is one or more in sodium hydroxide, sodium carbonate and sodium bicarbonate；Precipitant and each metal nitrate
The mol ratio of summation is 1.2 ~ 1.5:1.
3. the as claimed in claim 1 catalyst for being used to prepare 1,4-CHDM, it is characterised in that step (2) and
（3）In, the rotating speed of high-speed stirred is 2000-5000 r/min.
4. it is used to as claimed in claim 1 prepare the catalyst of 1,4-CHDM, it is characterised in that step (4)
In, the condition of crystallization is：Rotating speed 30-100r/min, temperature 50-80 DEG C, crystallization time 12-24h.
5. it is used to as claimed in claim 1 prepare the catalyst of 1,4-CHDM, it is characterised in that step (5)
In, baking temperature is 80 ~ 120 DEG C, and drying time is 2 ~ 24h；Roasting time is 2h ~ 24h.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110813292A (en) * | 2019-10-24 | 2020-02-21 | 湖北浚然新材料有限公司 | Dearsenic agent and preparation method thereof |
| CN114436770B (en) * | 2020-10-20 | 2024-05-03 | 中国石油化工股份有限公司 | Method for preparing cyclohexanedimethanol by hydrogenation of cyclohexanedicarboxylic acid dibasic ester |
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| DE60025874D1 (en) * | 1999-11-10 | 2006-04-20 | Nippon Catalytic Chem Ind | Process for the preparation of aromatic aldehydes by catalytic gas-phase oxidation of methylbenzene |
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