CN101514007B

CN101514007B - Beta zeolite/Y zeolite coexisting molecular sieve and method for synthesizing same

Info

Publication number: CN101514007B
Application number: CN2008100431134A
Authority: CN
Inventors: 马广伟; 谢在库; 滕加伟; 肖景娴
Original assignee: China Petroleum and Chemical Corp; Sinopec Shanghai Research Institute of Petrochemical Technology
Current assignee: China Petroleum and Chemical Corp; Sinopec Shanghai Research Institute of Petrochemical Technology
Priority date: 2008-02-20
Filing date: 2008-02-20
Publication date: 2011-04-27
Anticipated expiration: 2028-02-20
Also published as: CN101514007A

Abstract

The invention relates to a beta zeolite/Y zeolite coexisting molecular sieve and a method for synthesizing the same, and mainly solves the problems that a porous material synthesized by the prior art is single in pore-size, weak in acid and low in activity. The method prepares the beta zeolite/Y zeolite coexisting molecular sieve by adding a seed crystal containing a Y zeolite precursor and well controlling the nucleating and growing process of a molecular sieve during a synthesis process of beta zeolite. The coexistence phase ratio of the beta zeolite/Y zeolite coexisting molecular sieve is adjustable, and a mole relation of the components of the synthesized coexisting molecular sieve is nSiO2 :Al2O3, wherein n is between 4 and 400; the coexisting molecular sieve has more than two phases, the XRD diffraction pattern of the coexisting molecular sieve comprises a technical proposal that a maximum value of a distance d is at positions between 14.52-0.1 and 14.52+0.1 A, 11.32-0.1 and 11.32+0.1 A, 5.71-0.1 and 5.71+0.1 A, 4.14-0.1 and 4.14+0.1 A, 3.96-0.1 and 3.96+0.1 A, 3.78-0.05 and 3.78 +0.05 A, 3.50-0.1 and 3.50+0.1 A, 3.31-0.05 and 3.31+0.05 A, 3.02-0.05 and 3.02+0.05 A, and 2.86-0.1 and 2.86+0.1 A; therefore, the problems are solved well. The coexisting molecular sieve can be used in the industrial production of ethylene and propylene through the catalytic pyrolysis of naphtha.

Description

β zeolite/Y zeolite coexisting molecular sieve and synthetic method thereof

Technical field

The present invention relates to a kind of β zeolite/Y zeolite coexisting molecular sieve and synthetic method thereof.

Background technology

Y zeolite and β zeolite porous material are applied in field of petrochemical industry widely owing to have good shape selective catalysis performance and thermostability preferably.The aperture is evenly single separately, acidity is weak, activity is not high and selectivity is relatively poor, can not deal with complicated component separately, and they is to the catalytic performance difference of same reaction thing but owing to two kinds of molecular screen materials.Contain the above coexisting molecular sieve of two kinds of components, contain multi-stage artery structure, strong acid weak acid distribution range is wider, can handle molecular diameter complex component not of uniform size, and can bring into play their concerted catalysis effect.

Document CN1565967A, CN1565970A report adopts ZSM-5 molecular sieve or β zeolite as crystal seed, adds respectively in the resulting solution of β zeolite or MCM-49 molecular sieve, has synthesized the mixed crystal material of MCM-49 molecular sieve and β zeolite.Its catalytic effect is better than the effect of two kinds of molecular sieve mechanically mixing, but needs to add different crystal seeds in the building-up process as inductor, also needs to add fluorochemical in addition, and building-up process is comparatively complicated.

Document CN1393403 report adopts the method for segmentation crystallization to synthesize middle mesoporous-microporous composite molecular sieve composition, is used for heavy oil upgrading.Synthetic method is to prepare the reaction mixture gel of synthetic microporous molecular sieve earlier, under 30～300 ℃ of conditions, carry out the crystallization of fs then, after the crystallization 3～300 hours, the pH value of adjusting reaction mixture is 9.5～12, and the synthetic used template of mesoporous molecular sieve of adding, and then at 30～170 ℃ from depressing the hydrothermal crystallizing that carries out subordinate phase, crystallization time is 15～480 hours, mesoporous-microporous composite molecular sieve composition in obtaining, but the building-up process of molecular sieve needs the segmentation crystallization, and the pH value also will be regulated in the centre, and synthetic method is also comparatively complicated.

Document CN03133557.8 has reported and has synthesized the composite structure molecular sieve with TON and two kinds of structures of MFI under the static conditions, this molecular sieve has added a spot of crystal seed and salt in the preparation gelation process, control suitable crystallization parameter, can obtain the molecular sieve of two kinds of crystal formation different ratioss, silica alumina ratio obtains the reaction process that composite molecular screen of the present invention can be used for mixture such as petroleum fractions greater than 50 on the lattice of molecular sieve.Building-up process of the present invention also needs to add crystal seed and salt.

Document CN1583562 has reported a kind of double-micropore zeolites molecular sieve and preparation method, it is characterized in that adopting orderly synthesis method, tentatively synthesizes y-type zeolite by certain material proportion earlier; After it is mixed with the tetraethyl-amine bromide solution that is dissolved with ammoniacal liquor, adding a certain amount of silicon sol at last more fully stirs and makes it even, in 130 ℃～140 ℃ following crystallization 4～7 days, obtain having the composite zeolite molecular sieve of the two microvoid structures of Y/ β, this method is also similar with the segmentation crystallization.

Summary of the invention

Technical problem to be solved by this invention one of is to be single, acid weak, the active not high problem of prior art synthetic aperture of porous material.A kind of new coexisting molecular sieve is provided, and this coexisting molecular sieve has multi-stage artery structure, and strong acid weak acid distribution range is wider, active higher characteristics; Two of technical problem to be solved by this invention is the problems that do not relate to above-mentioned coexisting molecular sieve preparation method in the prior art, and a kind of preparation method of new coexisting molecular sieve is provided.

For one of solving the problems of the technologies described above, the technical solution used in the present invention is as follows: a kind of β zeolite/Y zeolite coexisting molecular sieve, the composition with following molar relationship: nSiO ₂: Al ₂O ₃, n=4 in the formula～400 is characterized in that described coexisting molecular sieve has two or more thing phases, its XRD diffracting spectrum is included in 14.52 ± 0.1,11.32 ± 0.1,5.71 ± 0.1,4.14 ± 0.1,3.96 ± 0.1,3.78 ± 0.05,3.50 ± 0.1,3.31 ± 0.05,3.02 there is d-spacing maximum value at ± 0.05,2.86 ± 0.1 dust places.

In the technique scheme, nSiO ₂: Al ₂O ₃The preferable range of n is n=8～200 in the formula, contains two kinds of Symbionts of β zeolite and Y zeolite in the coexisting molecular sieve at least mutually, and Symbiont phase adjustable ratio.

For solve the problems of the technologies described above two, the technical solution used in the present invention is as follows: a kind of synthetic method of coexisting molecular sieve may further comprise the steps:

(1) silicon source, aluminium source, alkali source, template M and water are mixed, reaction mixture with molar ratio computing is: SiO ₂/ Al ₂O ₃=4～400, OH ^-/ SiO ₂=0.001～10.0, M/SiO ₂=0.05～3.0, H ₂O/SiO ₂=10～500, regulating the pH value is 8～14;

(2) SiO to contain in the silicon source ₂Weight is benchmark, adds an amount of crystal seed in above-mentioned mixing solutions, and amount of seed is SiO ₂0.01～20% of weight, crystal seed are SiO ₂/ Al ₂O ₃Mol ratio is 10～200 the crystal grain that contains the Y zeolite presoma amorphous substance in 1～500 nanometer;

(3) the above-mentioned reaction mixture that will mix is put into closed pressure vessel under autogenous pressure, 80～220 ℃ of crystallization 8～200 hours;

(4) crystallization is good product takes out, and washing is filtered, and after the drying, makes coexisting molecular sieve; Wherein used silicon source is to be selected from least a in organosilicon, soft silica, silicon sol, solid oxidation silicon, silica gel, diatomite or the water glass; Used aluminium source is at least a in the oxide compound of the oxyhydroxide that is selected from aluminate, meta-aluminate, aluminium salt, aluminium, aluminium or the aluminiferous mineral; Used alkali source is to be selected from least a in the alkali-metal oxyhydroxide; Template used dose of M is selected from least a in organic amine or the inorganic ammonium.

In the technique scheme, reaction mixture is with molar ratio computing, and preferable range is: SiO ₂/ Al ₂O ₃=8～200, OH ^-/ SiO ₂=0.01～5.0, M/SiO ₂=0.1～1.0, H ₂O/SiO ₂=20～300, crystal seed is SiO ₂/ Al ₂O ₃The mol ratio preferable range is 20～100 the crystal grain preferable range that contains the Y zeolite presoma amorphous substance in 10～400 nanometers, and the amount of seed preferable range is SiO ₂0.1～10% of weight.Control pH value preferable range is 8～14, and more preferably scope is 9～14.Used organic amine preferred version is to be selected from least a in 4-propyl bromide, TPAOH, tetraethylammonium bromide, tetraethyl ammonium hydroxide, Tetrabutyl amonium bromide, TBAH, triethylamine, n-Butyl Amine 99, quadrol or the ethamine, when selecting mixed templates for use, mol ratio is 1: 1 or 1: 1: 1 (selecting three kinds of template for use); Inorganic ammonium preferred version is to be selected from least a in ammoniacal liquor, the ammonium salt; The pH value is regulated with dilute acid soln, and used dilute acid soln preferred version is to be selected from least a in dilute hydrochloric acid, dilute sulphuric acid, rare nitric acid, dilute phosphoric acid, oxalic acid or the acetate.The crystallization temperature preferable range is 100～200 ℃, and the crystallization time preferable range is 10～60 hours.

The synthetic method concrete operations of coexisting molecular sieve are, get the silicon source and the aluminium source of aequum by material proportion, make solution with dissolved in distilled water respectively, then two kinds of solution are mixed, the powerful stirring, the template M that adds aequum then stirs after 30 minutes and regulates the pH value in 8～14 scopes with dilute acid soln, supplies distilled water again.Colloidal sol is put into autoclave, control required temperature, crystallization was taken out 4 hours, 550 ℃ roastings of 2 times, 120 ℃ oven dry of washing 3 hours after 10～100 hours, can obtain described coexisting molecular sieve.

The present invention is because the template that has adopted suitable two or more things of while to grow mutually, regulate and be fit to the pH value scope that related thing is grown mutually, control is fit to the silica alumina ratio and the crystallization temperature of growth, under hydrothermal condition, can in mixed sols, induce the crystal seed of several thing phases simultaneously, in the environment that is fit to their growths, generated this coexisting molecular sieve then, because the surface and the interface of coexisting molecular sieve, acid have than big difference with the simple mutually mechanical blended of thing with specific surface, its acid amount is bigger, acidity is stronger, contain multistage pore canal, so catalytic performance is preferably arranged, can handle the different mixture material of molecular diameter, can be used in the naphtha catalytic pyrolysis preparing ethylene propylene reaction, the diene quality total recovery of ethene and propylene can reach more than 55%, has obtained better technical effect.

Description of drawings

Fig. 1 is the XRD diffracting spectrum of synthetic coexisting molecular sieve.

The present invention is further elaborated below by embodiment.

Embodiment

[embodiment 1]

Getting 569 gram Starsos is dissolved in the 900 gram deionized waters.In addition 133 gram Tai-Ace S 150 are dissolved in the 300 gram deionized waters, add in the sodium silicate solution under stirring.Continue then to be stirred to evenly, under 100 ℃, carried out conventional hydrothermal crystallizing 10 hours.Product descended dry 4 hours at 130 ℃ after washing, and promptly got Y zeolite crystal seed required for the present invention, and note is made M1.

[embodiment 2]

The method and the content that are provided according to embodiment 1 change the add-on of Tai-Ace S 150 into 267 grams, make Y zeolite crystal seed required for the present invention, are designated as M2.

[embodiment 3]

Get 284 gram Starsos, become solution A with 300 gram dissolved in distilled water, get 16.7 gram Tai-Ace S 150, make solution B with 100 gram distilled water, B solution is slowly poured in the A solution, the powerful stirring, add 29.4 gram tetraethyl ammonium hydroxides then, after stirring for some time, regulate the pH value 11 with dilute sulphuric acid, the mole proportioning of control colloidal sol is: Si: Al: M: H ₂O=1: 0.05: 0.2: 40, add 3.0 gram Y zeolite crystal seed M1, mixing solutions is put into autoclave, 150 ℃ of insulations 40 hours, take out 4 hours, 550 ℃ roastings of 2 times, 120 ℃ oven dry of washing 3 hours then, make β zeolite/Y zeolite coexisting material, the XRD diffracting spectrum as shown in Figure 1,14.52,11.32,5.71,4.14,3.96,3.78,3.50,3.31,3.02 there is d-spacing maximum value at 2.86 dust places.With the XRD diffraction quantitatively as can be known in the coexisting material β zeolite quality percentage composition be 66.5%, Y zeolite content is 33.5%.

[embodiment 4～8]

According to the method for embodiment 3, raw materials used as shown in table 4, the pH difference of control solution synthesizes β zeolite/Y zeolite coexisting material respectively, sees Table 1.The XRD diffracting spectrum is identical with embodiment 3, and the ratio of β zeolite and Y zeolite sees Table 3 in the coexisting material.

Table 1

Embodiment	The pH value of solution value	Sample number into spectrum
			Embodiment 4	8	FH-4
Embodiment 5	10	FH-5
			Embodiment 6	11	FH-6
Embodiment 7	13	FH-7

Embodiment 8

14

FH-8

[embodiment 9～19]

According to the method for embodiment 3, raw materials used as shown in table 4, the different mole proportionings of control solution see Table 2, synthesize β zeolite/Y zeolite coexisting material respectively.The XRD diffracting spectrum is identical with embodiment 3, and the ratio of β zeolite and Y zeolite sees Table 3 in the coexisting material.

Table 2

Embodiment	Solution mole proportioning	Sample number into spectrum
			Embodiment 9	Si∶Al∶M∶H ₂O∶OH ^-1＝1∶0.005∶0.4∶40∶5	FH-9
Embodiment 10	Si∶Al∶M∶H ₂O∶OH ^-1＝1∶0.01∶0.4∶40∶0.01	FH-10
			Embodiment 11	Si∶Al∶M∶H ₂O∶OH ^-1＝1∶0.1∶0.1∶50∶0.001	FH-11
Embodiment 12	Si∶Al∶M∶H ₂O∶OH ^-1＝1∶0.125∶0.2∶40∶0.5	FH-12
			Embodiment 13	Si∶Al∶M∶H ₂O∶OH ^-1＝1∶0.143∶0.1∶40∶1.2	FH-13
Embodiment 14	Si∶Al∶M∶H ₂O∶OH ^-1＝1∶0.05∶2∶30∶0.1	FH-14
			Embodiment 15	Si∶Al∶M∶H ₂O∶OH ^-1＝1∶0.05∶3∶20∶1.8	FH-15
Embodiment 16	Si∶Al∶M∶H ₂O∶OH ^-1＝1∶0.167∶0.05∶60∶2	FH-16
			Embodiment 17	Si∶Al∶M∶H ₂O∶OH ^-1＝1∶0.2∶0.01∶80∶4	FH-17
Embodiment 18	Si∶Al∶M∶H ₂O∶OH ^-1＝1∶0.25∶0.4∶100∶6	FH-18
			Embodiment 19	Si∶Al∶M∶H ₂O∶OH ^-1＝1∶0.5∶0.4∶300∶10	FH-19

[embodiment 20～23]

According to the method for embodiment 3, raw materials used as shown in table 4, the mole proportioning of control solution is identical, selects mixed templates for use, and mol ratio is 1: 1 or 1: 1: 1 (selecting three kinds of template for use), uses n-Butyl Amine 99 and quadrol successively respectively; Ethamine, quadrol and n-Butyl Amine 99; Tetraethylammonium bromide and n-Butyl Amine 99; Tetraethyl ammonium hydroxide, n-Butyl Amine 99 and triethylamine, synthetic β zeolite/Y zeolite coexisting material is designated as FH-20, FH-21, FH-22, FH-23 respectively.The XRD diffracting spectrum is identical with embodiment 3, and the ratio of β zeolite and Y zeolite sees Table 3 in the coexisting material.

[embodiment 24～28]

According to the method for embodiment 3, raw materials used as shown in table 4, the mole proportioning of control solution is identical, and crystallization temperature is set to 80 ℃ respectively; 100 ℃; 130 ℃; 160 ℃ and 220 ℃, synthesized β zeolite/Y zeolite coexisting material respectively, be designated as FH-24, FH-25, FH-26, FH-27 and FH-28.The XRD diffracting spectrum is identical with embodiment 3, and the ratio of β zeolite and Y zeolite sees Table 3 in the coexisting material.

[embodiment 29～33]

According to the method for embodiment 3, raw materials used as shown in table 4, the mole proportioning of control solution is identical, and crystallization time is controlled to be 10 hours respectively; 20 hours; 60 hours; 100 hours and 200 hours, synthesized β zeolite/Y zeolite coexisting material respectively, be designated as FH-29, FH-30, FH-31, FH-32 and FH-33.The XRD diffracting spectrum is identical with embodiment 3, and the ratio of β zeolite and Y zeolite sees Table 3 in the coexisting material.

[embodiment 34～38]

According to the method for embodiment 3, raw materials used as shown in table 4, the mole proportioning of control solution is identical, adds M1 crystal seed amount and is respectively 0.01%; 0.1%; 1%; 10% and 20%, synthesized β zeolite/Y zeolite molecular sieve coexisting material respectively, be designated as FH-34, FH-35, FH-36, FH-37 and FH-38, the XRD diffracting spectrum is identical with embodiment 3, and the ratio of β zeolite and Y zeolite sees Table 3 in the coexisting material.

Table 3

Sample number into spectrum	β zeolite content (weight %)	Y zeolite content (weight %)
			FH-3	66.5	33.5
FH-4	89.6	10.4
			FH-5	78.1	21.9
FH-6	62.0	38.0
			FH-7	55.7	44.3
FH-8	16.2	83.8
			FH-9	92.5	7.5
FH-10	84.6	15.4
			FH-11	44.3	55.7
FH-12	28.0	72
			FH-13	16.6	83.4
FH-14	55.3	44.7
			FH-15	47.8	52.2
FH-16	30.3	69.7
			FH-17	24.6	75.4

FH-18	12.2	87.8
			FH-19	5.5	94.5
FH-20	18.5	81.5
			FH-21	21.1	78.9
FH-22	65.3	34.7
			FH-23	72.4	27.6
FH-24	16.2	83.8
			FH-25	28.8	71.2
FH-26	43.2	56.8
			FH-27	76.9	23.1
FH-28	55.2	44.8
			FH-29	23.3	76.7
FH-30	31.4	68.6
			FH-31	54.9	45.1
FH-32	43.7	56.3
			FH-33	38.9	61.1
FH-34	89.8	10.2
			FH-35	82.6	17.4
FH-36	74.2	25.8
			FH-37	46.6	53.4
FH-38	33.5	66.5

Table 4

Sample number into spectrum	Raw materials used
						The silicon source	The aluminium source	Template	Alkali source	Acid
	FH-4	Starso	Tai-Ace S 150	Quadrol, tetraethyl ammonium hydroxide	Sodium hydroxide						Dilute sulphuric acid
FH-5						Silicon sol	Sodium metaaluminate	N-Butyl Amine 99	Sodium hydroxide	Dilute hydrochloric acid
	FH-6	Soft silica	Pseudo-boehmite	Tetraethyl ammonium hydroxide	Sodium hydroxide						Rare nitric acid
FH-7						Silica gel	Bauxite	N-Butyl Amine 99	Sodium hydroxide	Oxalic acid
	FH-8	Diatomite	Aluminum hydroxide sol	Quadrol	Sodium hydroxide						Acetate
FH-9						Water glass	Tai-Ace S 150	Tetraethyl ammonium hydroxide	Sodium hydroxide	Dilute hydrochloric acid
	FH-10	Tetraethoxy	Tai-Ace S 150	Quadrol	Sodium hydroxide						Dilute hydrochloric acid
FH-11						Silicon sol	Aluminum nitrate	Ethamine	Sodium hydroxide	Dilute hydrochloric acid
	FH-12	Silicon sol	Aluminum chloride	Tetraethyl ammonium hydroxide	Sodium hydroxide						Dilute sulphuric acid
FH-13						Silicon sol	Sodium aluminate	Ethamine	Sodium hydroxide	Dilute sulphuric acid
	FH-14	Silicon sol	Tai-Ace S 150	Ethamine, tetraethyl ammonium hydroxide	Sodium hydroxide						Dilute sulphuric acid
FH-15						Silicon sol	Tai-Ace S 150	Ethamine	Potassium hydroxide	Dilute sulphuric acid
	FH-16	Silicon sol	Sodium aluminate	TPAOH	Potassium hydroxide						Dilute hydrochloric acid
FH-17						Starso	Sodium aluminate	4-propyl bromide	Potassium hydroxide	Dilute hydrochloric acid
	FH-18	Starso	Sodium aluminate	Tetraethyl ammonium hydroxide	Potassium hydroxide						Dilute hydrochloric acid
FH-19						Starso	Sodium aluminate	Tetraethylammonium bromide	Potassium hydroxide	Dilute hydrochloric acid
	FH-20	Starso	Sodium aluminate	N-Butyl Amine 99, tetraethyl ammonium hydroxide	Potassium hydroxide						Dilute sulphuric acid

FH-21	Starso, silicon sol	Sodium metaaluminate	Ethamine, quadrol	Potassium hydroxide	Rare nitric acid
						FH-22	Tetraethoxy, silicon sol	Sodium metaaluminate	Ammoniacal liquor, tetraethyl ammonium hydroxide	Potassium hydroxide, sodium hydroxide	Dilute sulphuric acid, dilute hydrochloric acid
FH-23	Tetraethoxy	Sodium metaaluminate, Tai-Ace S 150	TPAOH, n-Butyl Amine 99	Potassium hydroxide, sodium hydroxide	Dilute sulphuric acid, dilute hydrochloric acid
						FH-24	Tetraethoxy	Sodium metaaluminate, Tai-Ace S 150	Tetraethyl ammonium hydroxide	Potassium hydroxide, sodium hydroxide	Dilute sulphuric acid, dilute hydrochloric acid
FH-25	Tetraethoxy	Sodium metaaluminate	Triethylamine	Potassium hydroxide	Rare nitric acid
						FH-26	Water glass	Tai-Ace S 150	Triethylamine	Sodium hydroxide	Rare nitric acid
FH-27	Water glass	Tai-Ace S 150	Triethylamine, tetraethyl ammonium hydroxide	Sodium hydroxide	Rare nitric acid
						FH-28	Water glass	Sodium aluminate	Triethylamine	Sodium hydroxide	Rare nitric acid
FH-29	Silica gel	Sodium aluminate	N-Butyl Amine 99	Sodium hydroxide	Rare nitric acid
						FH-30	Soft silica	Sodium aluminate	TBAH	Sodium hydroxide	Rare nitric acid
FH-31	Silica gel	Sodium aluminate	Tetrabutyl amonium bromide	Sodium hydroxide	Rare nitric acid
						FH-32	Silica gel	Sodium aluminate	Ammoniacal liquor	Sodium hydroxide	Dilute sulphuric acid
FH-33	Silicon sol	Sodium aluminate	Tetraethyl ammonium hydroxide	Sodium hydroxide	Dilute sulphuric acid
						FH-34	Silicon sol	Sodium aluminate	Ammoniacal liquor	Sodium hydroxide	Dilute sulphuric acid
FH-35	Water glass	Tai-Ace S 150	Ethamine, triethylamine	Sodium hydroxide	Dilute sulphuric acid
						FH-36	Starso	Sodium aluminate	Tetraethyl ammonium hydroxide	Potassium hydroxide	Rare nitric acid
FH-37	Silicon sol	Sodium aluminate	N-Butyl Amine 99, triethylamine	Potassium hydroxide	Rare nitric acid
						FH-38	Starso	Sodium aluminate	N-Butyl Amine 99	Sodium hydroxide	Rare nitric acid

[embodiment 39]

Getting embodiment 3 synthetic coexisting molecular sieves, is that 5% ammonium nitrate solution carries out ammonium exchange 3 hours at 90 ℃ with weight percentage.Product after filtration, washing, 130 ℃ down after dry 3 hours, repeat an ammonium exchange again, after filtration, washing, 130 ℃ be down after dry 3 hours, 550 ℃ of following roastings 3 hours, make the Hydrogen coexisting molecular sieve, then compressing tablet, break into pieces, sieve, it is standby to get 20～40 purpose particles.With C ₄～C ₁₀Petroleum naphtha be raw material (the raw material physical index sees Table 6), be 12 millimeters fixed-bed reactor with diameter, at 650 ℃, weight space velocity 0.5h ^-1, water/weight of oil is to check and rate under the condition of 0.02MPa than 3: 1, pressure, the ethene mass yield reaches 26.1%, the propylene mass yield reaches 29.7%, ethene and propylene diene quality total recovery reach 55.8%, have obtained better technical effect.

[embodiment 40]

Get embodiment 3 synthetic coexisting molecular sieves, the method for pressing embodiment 39 makes the Hydrogen coexisting molecular sieve.With the desorption curve of temperature programmed desorption(TPD) device mensuration ammonia, represent strength of acid with desorption temperature strong, the weak acid position.The ammonia that desorption goes out absorbs with excessive dilution heat of sulfuric acid through after the chromatogram, carries out back titration with standard solution of sodium hydroxide then, calculates the acid amount of tested molecular sieve thus.Measurement result such as table 5.

[comparative example 1]

The silica alumina ratio of getting the production of Shanghai petrochemical industry research institute is 40 beta-zeolite molecular sieve, measures its acidity by the method for embodiment 40, and the result is as shown in table 5.

[comparative example 2]

The silica alumina ratio of getting the production of Shanghai petrochemical industry research institute is 40 Y zeolite molecular sieve, measures its acidity by the method for embodiment 40, and the result is as shown in table 5.

Table 5

Embodiment or comparative example	Molecular sieve type	Weak acid position desorption temperature (℃)	The strong acidic site desorption temperature (℃)	Acid amount (* 10 ^-4Moles per gram)
					Embodiment 39	β zeolite/Y zeolite	296	508	12.71
Comparative example 1	The β zeolite	241	512	11.01
					Comparative example 2	Y zeolite	254	430	9.5

Table 6 feed naphtha index

Project	Data
		Density (20 ℃) kilogram/rice ³	704.6
Boiling range is boiling range ℃ just	40
		Whole boiling range ℃	160

Saturated vapor pressure (20 ℃) kPa	50.2
		Alkane % (weight %)	65.18
Normal paraffin % (weight %) in the alkane	＞32.5
		Naphthenic hydrocarbon % (weight %)	28.44
Alkene % (weight %)	0.17
		Aromatic hydrocarbons % (weight %)	6.21

Claims

1. β zeolite/Y zeolite coexisting molecular sieve, the composition with following molar relationship: nSiO ₂: Al ₂O ₃, n=4 in the formula～400 is characterized in that described material contains two kinds of Symbionts of β zeolite and Y zeolite molecular sieve mutually, its XRD diffracting spectrum is included in 14.52 ± 0.1,11.32 ± 0.1,5.71 ± 0.1,4.14 ± 0.1,3.96 ± 0.1,3.78 ± 0.05,3.50 ± 0.1,3.31 ± 0.05,3.02 there is d-spacing maximum value at ± 0.05,2.86 ± 0.1 dust places.

2. β zeolite according to claim 1/Y zeolite coexisting molecular sieve is characterized in that n=8～200.

3. the synthetic method of β zeolite according to claim 1/Y zeolite coexisting molecular sieve may further comprise the steps:

(2) SiO to contain in the silicon source ₂Weight is benchmark, adds an amount of crystal seed in above-mentioned mixing solutions, and amount of seed is contained SiO in the raw material ₂0.01～20% of weight, crystal seed are SiO ₂/ Al ₂O ₃Mol ratio is 10～200 the crystal grain that contains the Y zeolite presoma amorphous substance in 1～500 nanometer;

(3) the above-mentioned reaction mixture that will mix is put into encloses container under autogenous pressure, 80～220 ℃ of crystallization 8～200 hours;

(4) crystallization is good product takes out, and after washing, filtration and drying, makes coexisting molecular sieve; Wherein used silicon source is selected from least a in organosilicon, soft silica, silicon sol, silica gel, diatomite or the water glass; Used aluminium source is selected from least a in the oxide compound of oxyhydroxide, aluminium of aluminate, meta-aluminate, aluminium salt, aluminium or the aluminiferous mineral; Used alkali source is selected from least a in the alkali-metal oxyhydroxide; Template used dose of M is selected from least a in organic amine or the inorganic ammonium.

4. the synthetic method of β zeolite according to claim 3/Y zeolite coexisting molecular sieve is characterized in that reaction mixture with molar ratio computing is: SiO ₂/ Al ₂O ₃=8～200, OH ^-/ SiO ₂=0.01～5.0, M/SiO ₂=0.1～1.0, H ₂O/SiO ₂=20～300, amount of seed is SiO in the raw material ₂0.1～10% of weight.

5. the synthetic method of β zeolite according to claim 3/Y zeolite coexisting molecular sieve, it is characterized in that the pH value regulates with dilute acid soln, used dilute acid soln is at least a in dilute hydrochloric acid, dilute sulphuric acid, rare nitric acid, dilute phosphoric acid, oxalic acid or the acetate, and regulating the pH value is between 9～14.

6. the synthetic method of β zeolite according to claim 3/Y zeolite coexisting molecular sieve is characterized in that described template M is selected from least a in 4-propyl bromide, TPAOH, tetraethylammonium bromide, tetraethyl ammonium hydroxide, Tetrabutyl amonium bromide, TBAH, triethylamine, n-Butyl Amine 99, quadrol, ammoniacal liquor or the ethamine.

7. the synthetic method of β zeolite according to claim 3/Y zeolite coexisting molecular sieve is characterized in that described crystal seed is SiO ₂/ Al ₂O ₃Mol ratio is 20～100 the crystal grain that contains the Y zeolite presoma amorphous substance in 10～400 nanometers.

8. the synthetic method of β zeolite according to claim 3/Y zeolite coexisting molecular sieve is characterized in that crystallization temperature is 100～200 ℃, and crystallization time is 10～60 hours.