CN104513142A - Preparation method for polyformaldehyde dimethyl ether adopted as alcohol-containing fuel additive - Google Patents
Preparation method for polyformaldehyde dimethyl ether adopted as alcohol-containing fuel additive Download PDFInfo
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- CN104513142A CN104513142A CN201310459550.5A CN201310459550A CN104513142A CN 104513142 A CN104513142 A CN 104513142A CN 201310459550 A CN201310459550 A CN 201310459550A CN 104513142 A CN104513142 A CN 104513142A
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- dimethyl ether
- polyoxymethylene dimethyl
- fuel additive
- paraformaldehyde
- alcohol
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C41/00—Preparation of ethers; Preparation of compounds having groups, groups or groups
- C07C41/48—Preparation of compounds having groups
- C07C41/50—Preparation of compounds having groups by reactions producing groups
- C07C41/56—Preparation of compounds having groups by reactions producing groups by condensation of aldehydes, paraformaldehyde, or ketones
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C41/00—Preparation of ethers; Preparation of compounds having groups, groups or groups
- C07C41/48—Preparation of compounds having groups
- C07C41/58—Separation; Purification; Stabilisation; Use of additives
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Abstract
The present invention relates to a preparation method for polyformaldehyde dimethyl ether adopted as an alcohol-containing fuel additive, wherein a mixture of methanol and a paraformaldehyde dissolving liquid reacts in a reaction kettle under the effect of a catalyst. The method is characterized in that a polyferric sulfate compounding material is adopted as a catalyst, and reacts with a mixture of methanol and paraformaldehyde in a reaction kettle, a pre-dewatering treatment is performed after distillation, and deep molecular sieve dewatering is performed to produce the polyformaldehyde dimethyl ether adopted as the alcohol-containing fuel additive, such that the influence of application of the acid as the catalyst on the polyformaldehyde dimethyl ether decomposition is eliminated so as to cause the short storage time; and the water contained in the reactant and the water produced from the reaction are removed so as to reduce the water content in the product and reduce the hydrolysis production rate of the product, such that the Reid vapor pressure is reduced, the water resistance is improved, the gasoline quality is ensured, and the technical problem that the vehicle easily produces gas blocking at the high altitude area in the high temperature season is prevented.
Description
Technical field
The present invention relates to a kind of polyoxymethylene dimethyl ether preparation method making alcohol fuel additive.
Background technology
The general molecular formula of polyoxymethylene dimethyl ether is H
3cO (CH
2o)
ncH
3the wherein positive integer of n>=1, its common preparation method is that catalysis methanol and paraformaldehyde reactant aqueous solution are prepared and obtain under an acidic catalyst, identical with the character of acetal, is stable in alkalescence or neutral environment, but, due to hydrolysis also can be caused under the effect of an acidic catalyst, first generate hemiacetal and methyl alcohol, further hemiacetal is hydrolyzed, generate formaldehyde and methyl alcohol, cause the stability of polyoxymethylene dimethyl ether to can not get ensureing like this.
Show through experimental data, polyoxymethylene dimethyl ether is under sulfuric acid or hydrochloric acid existent condition, paraformaldehyde is heated and Methanol is standby at 150-180 DEG C, reaction times is 12-15h, the decomposition reaction of carbonic acid gas formation and dme can be caused like this, and when polyoxymethylene is 6:1 with methanol quality ratio, the high molecular polymer of n >=100 can be generated, should not as alcohol fuel additive.
And at present, producing the formation of flue dust or cigarette ash to reduce conventional diesel engine or gasoline engine fuel combustion processes, the importance added in fuel containing alcohol additive is day by day remarkable.But these additives existing are usually because the molecular mass containing the polyoxymethylene dimethyl ether of impurity or high-polymerization degree is insoluble to too greatly the fuel of petrol motor or diesel engine and reduces flash-point.For this reason, there is many trials, petrol motor or diesel-dope have been improved, as the patent No. patent that is US2449469 provides the polyoxymethylene dimethyl ether of n=2-4, made additive more be suitable for being added in fuel, as alcohol fuel; The patent No. is the polyoxymethylene dimethyl ether that the patent of US5746785 provides n=1-10, and the amount of being added in fuel has been done to define, the burning of suitable fuel more; The patent No. is the patent of US6392102 is that the reactant removed in product polyoxymethylene dimethyl ether contributes; And the patent preparing the method for polyoxymethylene dimethyl ether that the patent No. is 200580036662.3 to be the moisture content reduced in polyoxymethylene dimethyl ether contribute; Simultaneously the patent No. is patent utilization trioxymethylene, methyl alcohol, methylal and the concentrated formaldehyde of 200710018474.9 is raw material, in an acidic catalyst, temperature is 60-140 DEG C, pressure is the polyoxymethylene dimethyl ether preparing n=3-6 under 0.5-4MPa, control the polymerization degree of polyoxymethylene dimethyl ether, improve the output capacity of polyoxymethylene dimethyl ether to 43%.
In above-mentioned prior art, although to the polymerization degree of polyoxymethylene dimethyl ether, the amount being added into fuel has been done to define, also reduce the moisture content of polyoxymethylene dimethyl ether simultaneously, but, still following shortcoming is there is in above-mentioned technology, incorrect for the impurity treatment in polyoxymethylene dimethyl ether, cause the reduced rate of moisture not high, and the moisture generated is not dealt with, and then cause containing the impurity such as moisture and reactant, simultaneously, utilize acid as catalyst, product is caused to be easy to when storing decompose, ratio defective product is caused to decline, so not only can affect the advantage adding in fuel the quality improving fuel, the quality of fuel itself also can be caused on the contrary to decline.
Summary of the invention
In order to solve the above-mentioned technical problem existed in prior art, the invention provides one and can promote fuel quality, reduce impurity and moisture content, so long-term its stability of guarantee, the polyoxymethylene dimethyl ether preparation method making alcohol fuel additive of improving product rate.
Particularly, be achieved by the following technical programs:
A kind of polyoxymethylene dimethyl ether preparation method making alcohol fuel additive, the method by methyl alcohol and paraformaldehyde lysate mixture under catalyst action in reaction kettle for reaction, employing bodied ferric sulfate compound is the mixture reaction of catalyzer and methyl alcohol and paraformaldehyde, predrainage process is carried out after distillation, carry out molecular sieve deep dehydration again and obtain the polyoxymethylene dimethyl ether making alcohol fuel additive, the environment avoiding reaction is the decomposition that acidity causes product polyoxymethylene dimethyl ether, and then reduce ratio defective product and quality, simultaneously by predrainage process, moisture content is wherein reduced 50-70%, pass through molecular sieve dehydration again, the impurity such as moisture wherein and reactant are deviate from, further also the moisture that reaction process generates also is deviate from, avoid being added on after in fuel, affect the quality of fuel itself.
Further, in order to avoid using acid as catalyzer, cause the decomposition of product polyoxymethylene dimethyl ether, and catalyzer too much causes the waste of raw material, described bodied ferric sulfate compound by containing the ferric iron solution of 11% and the weight of this solution 2% the liquid catalyst that forms of zinc oxide, the consumption of liquid catalyst is the 8-15% of methyl alcohol and paraformaldehyde gross weight.
Further, in order to bringing into of a part of outside moisture can be avoided, product water content is reduced, described bodied ferric sulfate compound by weight ratio be the bodied ferric sulfate of 86%, the FERRIC CHLORIDE ANHYDROUS of 10% and 4% the solid catalyst that forms of oxide powder and zinc, the consumption of solid catalyst is the 5-10% of methyl alcohol and paraformaldehyde gross weight.
Further, in order to the polymerization degree of methyl alcohol and paraformaldehyde can be made to maintain n=1-10 after polymerisation, ensure that polyoxymethylene dimethyl ether is suitable for the additive as fuel, described methyl alcohol and the mass ratio of paraformaldehyde are 1-5:1.
Further, described methyl alcohol and the mass ratio of paraformaldehyde are 2-4:1.
Preferably, described methyl alcohol and the mass ratio of paraformaldehyde are 3:1.
Further, in order to ensure that reaction can normally be carried out fast, product also can not be caused to be decomposed at 150-180 DEG C, the temperature that the mixture of described catalyzer and methyl alcohol and paraformaldehyde reacts in a kettle. is 40-140 DEG C, and pressure is 0.1-1.6MPa.
Further, in order to the polyoxymethylene dimethyl ether being suitable for adding to Fuel Petroleum and diesel oil fuel is separated, and store as required, guaranteed quality, described predrainage process the n=1-2 being less than 100 DEG C and the polyoxymethylene dimethyl ether cut of n=3-6 that is greater than 100 DEG C is proceeded to after condensation within the condenser to be respectively equipped with in the water knockout of pre-dehydrating agent.
Further, while can deviating from moisture, ensure the later stage storage time product stability, described pre-dehydrating agent be solvent oil, toluene, dimethylbenzene, aromatic hydrocarbons mixture and C4-C8 remove the trimethyl carbinol higher alcohols in any one.
Preferably, described predrainage process is equipped with in the water knockout of gasoline by proceeding to after the polyoxymethylene dimethyl ether cut of the n=1-2 being less than 100 DEG C within the condenser condensation; The polyoxymethylene dimethyl ether cut of the n=3-6 being greater than 100 DEG C is proceeded to after condensation within the condenser and is equipped with in the water knockout of diesel oil.
Technique effect of the present invention is embodied in: be used as catalyzer by polyaluminum sulfate iron complexes, eliminates acid affects polyoxymethylene dimethyl ether decomposition as catalyzer, and then causes storage time shorter; Simultaneously, by carrying out temperature control to cut after distillation, the polyoxymethylene dimethyl ether of n=1-2 and n=3-6 is separated and carries out predrainage process, not only by reactant with moisture eliminate in the lump, also the moisture that reaction produces also is eliminated, and then reducing the amount of moisture contained in product, the hydrolysis reducing product occurs; And, by the selection of pre-dehydrating agent, ensure that other impurity contained in product remove in the lump in the process of molecular sieve dehydration, improve the quality of polyoxymethylene dimethyl ether, it also avoid product simultaneously and reduce ratio defective product because of rotten in storage, and then affect the quality heterosis added in the fuel of gasoline or diesel engine, it also avoid the technical problem affecting fuel quality, further optimize polyoxymethylene dimethyl ether as alcohol fuel additive.
Accompanying drawing explanation
Fig. 1 is the polyoxymethylene dimethyl ether preparation method process flow sheet that the present invention makes alcohol fuel additive.
Embodiment
Describe technical scheme of the present invention to can clearly understand, below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is further elaborated, but claimed scope is not only confined to done description.
In the present invention " predrainage process " refer to two tapered shaped cans predrainage treatment facility being arranged on reactor condenser downstream, receive respectively steam from reactor be less than 100 DEG C and be greater than the cut of 100 DEG C, and in two tapered shaped cans, inject the gasoline measured and diesel oil respectively, containing water, methyl alcohol and other impurity and polyoxymethylene dimethyl ether, after running into gasoline or diesel oil, polyoxymethylene dimethyl ether dissolves in oil product, and water, the pot bottom of methyl alcohol and other impurity sedimentations, after being separated, the mixture of polyoxymethylene dimethyl ether and oil product can be obtained again through molecular sieve dehydration, namely as the additive of automobile-used alcohol fuel.
Embodiment one
Be that 1:1 adds in reactor by methyl alcohol and paraformaldehyde according to mass ratio, and the polyaluminum sulfate iron complexes adding 5% of methyl alcohol and polymerization formaldehyde gross weight is wherein as catalyzer, the temperature of reactor is risen to 40 DEG C in 1h, and to adjust pressure be 0.1MPa, make reactant distillation reaction in a kettle., the cut and the temperature that temperature are less than the n=1-2 of 100 DEG C are greater than the cut of the n=3-6 of 100 DEG C respectively through after condenser condenses, be enclosed in the Erlenmeyer flask that condenser downstream is arranged, and in Erlenmeyer flask, pre-dehydrating agent is housed, predrainage process is carried out to cut, and then be separated, obtain mixture and the moisture of the polyoxymethylene dimethyl ether after predrainage process and oil product, methyl alcohol and other impurity, by moisture, methyl alcohol and other impurity return in reactor, and the mixture of dme and oil product is proceeded to molecular sieve carry out the process of molecular sieve deep dehydration, the polyoxymethylene dimethyl ether making fuel dope can be obtained.
Embodiment two
Be that 2:1 adds in reactor by methyl alcohol and paraformaldehyde according to mass ratio, and the polyaluminum sulfate iron complexes adding 8% of methyl alcohol and polymerization formaldehyde gross weight is wherein as catalyzer, the temperature of reactor is risen to 60 DEG C in 1h, and to adjust pressure be 0.3MPa, make reactant distillation reaction in a kettle., the cut and the temperature that temperature are less than the n=1-2 of 100 DEG C are greater than the cut of the n=3-6 of 100 DEG C respectively through after condenser condenses, be enclosed in the Erlenmeyer flask that condenser downstream is arranged, and in Erlenmeyer flask, pre-dehydrating agent is housed, predrainage process is carried out to cut, and then be separated, obtain mixture and the moisture of the polyoxymethylene dimethyl ether after predrainage process and oil product, methyl alcohol and other impurity, by moisture, methyl alcohol and other impurity return in reactor, and the mixture of dme and oil product is proceeded to molecular sieve carry out the process of molecular sieve deep dehydration, the polyoxymethylene dimethyl ether making fuel dope can be obtained.
Embodiment three
Be that 3:1 adds in reactor by methyl alcohol and paraformaldehyde according to mass ratio, and the polyaluminum sulfate iron complexes adding 10% of methyl alcohol and polymerization formaldehyde gross weight is wherein as catalyzer, the temperature of reactor is risen to 80 DEG C in 1h, and to adjust pressure be 0.9MPa, make reactant distillation reaction in a kettle., the cut and the temperature that temperature are less than the n=1-2 of 100 DEG C are greater than the cut of the n=3-6 of 100 DEG C respectively through after condenser condenses, be enclosed in the Erlenmeyer flask that condenser downstream is arranged, and in Erlenmeyer flask, pre-dehydrating agent is housed, predrainage process is carried out to cut, and then be separated, obtain mixture and the moisture of the polyoxymethylene dimethyl ether after predrainage process and oil product, methyl alcohol and other impurity, by moisture, methyl alcohol and other impurity return in reactor, and the mixture of dme and oil product is proceeded to molecular sieve carry out the process of molecular sieve deep dehydration, the polyoxymethylene dimethyl ether making fuel dope can be obtained.
Embodiment four
Be that 4:1 adds in reactor by methyl alcohol and paraformaldehyde according to mass ratio, and the polyaluminum sulfate iron complexes adding 12% of methyl alcohol and polymerization formaldehyde gross weight is wherein as catalyzer, the temperature of reactor is risen to 100 DEG C in 1h, and to adjust pressure be 1.4MPa, make reactant distillation reaction in a kettle., the cut and the temperature that temperature are less than the n=1-2 of 100 DEG C are greater than the cut of the n=3-6 of 100 DEG C respectively through after condenser condenses, be enclosed in the Erlenmeyer flask that condenser downstream is arranged, and in Erlenmeyer flask, pre-dehydrating agent is housed, predrainage process is carried out to cut, and then be separated, obtain mixture and the moisture of the polyoxymethylene dimethyl ether after predrainage process and oil product, methyl alcohol and other impurity, by moisture, methyl alcohol and other impurity return in reactor, and the mixture of dme and oil product is proceeded to molecular sieve carry out the process of molecular sieve deep dehydration, the polyoxymethylene dimethyl ether making fuel dope can be obtained.
Embodiment five
Be that 5:1 adds in reactor by methyl alcohol and paraformaldehyde according to mass ratio, and the polyaluminum sulfate iron complexes adding 15% of methyl alcohol and polymerization formaldehyde gross weight is wherein as catalyzer, the temperature of reactor is risen to 140 DEG C in 1h, and to adjust pressure be 1.6MPa, make reactant distillation reaction in a kettle., the cut and the temperature that temperature are less than the n=1-2 of 100 DEG C are greater than the cut of the n=3-6 of 100 DEG C respectively through after condenser condenses, be enclosed in the Erlenmeyer flask that condenser downstream is arranged, and in Erlenmeyer flask, pre-dehydrating agent is housed, predrainage process is carried out to cut, and then be separated, obtain mixture and the moisture of the polyoxymethylene dimethyl ether after predrainage process and oil product, methyl alcohol and other impurity, by moisture, methyl alcohol and other impurity return in reactor, and the mixture of dme and oil product is proceeded to molecular sieve carry out the process of molecular sieve deep dehydration, the polyoxymethylene dimethyl ether making fuel dope can be obtained.
Embodiment six
In embodiment one, embodiment two, embodiment three, embodiment four or embodiment five bodied ferric sulfate polymkeric substance be containing the ferric iron solution of 11% and the weight of this solution 2% the liquid catalyst of zinc oxide composition replace, consumption is the 8-15% of methyl alcohol and polyoxymethylene gross weight.
Embodiment seven
In embodiment one, embodiment two, embodiment three, embodiment four or embodiment five bodied ferric sulfate polymkeric substance be by weight ratio be the bodied ferric sulfate of 86%, the FERRIC CHLORIDE ANHYDROUS of 10% and 4% the solid catalyst that forms of oxide powder and zinc replace, consumption is the 5-10% of methyl alcohol and paraformaldehyde gross weight.
Embodiment eight
Pre-dehydrating agent in embodiment one, embodiment two, embodiment three, embodiment four, embodiment five, embodiment six or embodiment seven be solvent oil, toluene, dimethylbenzene, aromatic hydrocarbons mixture and C4-C8 remove the trimethyl carbinol higher alcohols in any one.
Embodiment nine
Being less than what fill in the Erlenmeyer flask of the cut of the n=1-2 of 100 DEG C in temperature in embodiment one, embodiment two, embodiment three, embodiment four, embodiment five, embodiment six or embodiment seven is gasoline; Being greater than what fill in the Erlenmeyer flask of the cut of the n=3-6 of 100 DEG C in temperature is diesel oil.
Embodiment ten
The lysate that the paraformaldehyde of 300kg and the methyl alcohol of 600kg at room temperature obtain is pumped in reactor, and add the bodied ferric sulfate 72kg of liquid and zinc oxide 1.44kg as catalyzer, open stirrer again and stir intensification, in 1h, temperature is risen to 40 DEG C, then in 9h, 140 DEG C are risen to the heat-up rate of 10 DEG C/h, pressure stops heating up when rising to 1.6MPa by 0.1MPa, proceed to normal-temperature distilled after cooling, being flowed into after condenser cooling by the cut of the n=1-2 being less than 100 DEG C is equipped with in the predrainage tank of gasoline, through molecular sieve deep dehydration, obtain the polyoxymethylene dimethyl ether 576kg as petrol motor alcohol fuel additive, being flowed into after condenser cooling by the cut of the n=3-6 being greater than 100 DEG C is equipped with in the predrainage tank of gasoline, through molecular sieve deep dehydration, obtains the polyoxymethylene dimethyl ether 144kg of diesel engine alcohol fuel additive, twice dehydration and two predrainage tanks remove water 135kg.Use the mixture moisture content result after gas chromatography determination dehydration as follows:
| Before process | After process | |
| Be less than the cut of the n=1-2 of 100 DEG C | 7% | 2% |
| Be greater than the cut of the n=3-6 of 100 DEG C | 4% | 1% |
Embodiment 11
The lysate that the paraformaldehyde of 400kg and the methyl alcohol of 400kg at room temperature obtain is pumped in reactor, and add the bodied ferric sulfate 34.4kg of liquid, FERRIC CHLORIDE ANHYDROUS 4kg and zinc oxide 1.6kg is as catalyzer, open stirrer again and stir intensification, in 1h, temperature is risen to 40 DEG C, then in 8h, 140 DEG C are risen to the heat-up rate of 18 DEG C/h, now pressure is 1.5MPa, after maintaining 2h, stopping is heated, proceed to normal-temperature distilled after cooling, being flowed into after condenser cooling by the cut of the n=1-2 being less than 100 DEG C is equipped with in the predrainage tank of gasoline, through molecular sieve deep dehydration, obtain the polyoxymethylene dimethyl ether 408kg as petrol motor alcohol fuel additive, being flowed into after condenser cooling by the cut of the n=3-6 being greater than 100 DEG C to 230 DEG C is equipped with in the predrainage tank of gasoline, through molecular sieve deep dehydration, obtains the polyoxymethylene dimethyl ether 125kg of diesel engine alcohol fuel additive, twice dehydration and two predrainage tanks remove water 145kg.Use the mixture moisture content result after gas chromatography determination dehydration as follows:
| Before process | After process | |
| Be less than the cut of the n=1-2 of 100 DEG C | 8% | 3% |
| Be greater than the cut of the n=3-6 of 100 DEG C | 2% | 1% |
Polyoxymethylene dimethyl ether is as follows as the experimental example of fuel dope:
Test example one
In the allotment of E10 ethanol petrol, use volume ratio to be the component oil of 70%, the concentration adding polyoxymethylene dimethyl ether of the present invention be 50% automobile-used alcohol fuel additive 20% and ethanol 10% after, through measuring phase separation temperature, then can reach-50 DEG C, eliminate the use of higher alcohols solubility promoter.
Test example two
In the allotment of M15 methanol gasoline, volume ratio is used to be the component oil of 90%, the concentration adding polyoxymethylene dimethyl ether of the present invention is the automobile-used alcohol fuel additive 10% of 80%, through measuring phase separation temperature, then can reach-50 DEG C, eliminate the use of higher alcohols solubility promoter, water resisting property is brought up to 300% of standard value simultaneously.
Draw through overtesting, Methanol Plant provides the distortion alcohol of directly allotment to methanol gasoline allotment enterprise, often cannot use because water content increases, but after use the present invention adds the polyoxymethylene dimethyl ether 5% of n=2, Reid vapour pressure is down to 71KPa by 85KPa, make the water resisting property of formulated product improve three times, ensure that the quality of gasoline, prevent the technical problem of high temperature season and the easy vapour lock of high altitude localities automobile.After the polyoxymethylene dimethyl ether of the n=3-6 simultaneously using the present invention to prepare in diesel oil and ethanol add 10% according to volume ratio, the zero pour of product can be made to reduce to-5 DEG C by 15 DEG C, polishing scratch index declines 60%.
Claims (10)
1. make the polyoxymethylene dimethyl ether preparation method of alcohol fuel additive for one kind, the method by methyl alcohol and paraformaldehyde lysate mixture under catalyst action in reaction kettle for reaction, it is characterized in that: employing bodied ferric sulfate compound is that the mixture of catalyzer and methyl alcohol and paraformaldehyde reacts in a kettle., carry out predrainage process after distillation, then carry out molecular sieve deep dehydration and obtain the polyoxymethylene dimethyl ether making alcohol fuel additive.
2. make the polyoxymethylene dimethyl ether preparation method of alcohol fuel additive as claimed in claim 1, it is characterized in that: described bodied ferric sulfate compound by containing the ferric iron solution of 11% and the weight of this solution 2% the liquid catalyst that forms of zinc oxide, the consumption of liquid catalyst is the 8-15% of methyl alcohol and paraformaldehyde gross weight.
3. make the polyoxymethylene dimethyl ether preparation method of alcohol fuel additive as claimed in claim 1 or 2, it is characterized in that: described bodied ferric sulfate compound by weight ratio be the bodied ferric sulfate of 86%, the FERRIC CHLORIDE ANHYDROUS of 10% and 4% the solid catalyst that forms of oxide powder and zinc, the consumption of solid catalyst is the 5-10% of methyl alcohol and paraformaldehyde gross weight.
4. make the polyoxymethylene dimethyl ether preparation method of alcohol fuel additive as claimed in claim 1, it is characterized in that: described methyl alcohol and the mass ratio of paraformaldehyde are 1-5:1.
5. the polyoxymethylene dimethyl ether preparation method making alcohol fuel additive as described in claim 1 or 4, is characterized in that: described methyl alcohol and the mass ratio of paraformaldehyde are 2-4:1.
6. the polyoxymethylene dimethyl ether preparation method making alcohol fuel additive as described in claim 1 or 4, is characterized in that: described methyl alcohol and the mass ratio of paraformaldehyde are 3:1.
7. make the polyoxymethylene dimethyl ether preparation method of alcohol fuel additive as claimed in claim 1, it is characterized in that: the temperature that the mixture of described catalyzer and methyl alcohol and paraformaldehyde reacts in a kettle. is 40-140 DEG C, and pressure is 0.1-1.6MPa.
8. make the polyoxymethylene dimethyl ether preparation method of alcohol fuel additive as claimed in claim 1, it is characterized in that: described predrainage process the n=1-2 being less than 100 DEG C and the polyoxymethylene dimethyl ether cut of n=3-6 that is greater than 100 DEG C is proceeded to after condensation within the condenser to be respectively equipped with in the water knockout of pre-dehydrating agent.
9. make the polyoxymethylene dimethyl ether preparation method of alcohol fuel additive as claimed in claim 8, it is characterized in that: described pre-dehydrating agent be solvent oil, toluene, dimethylbenzene, aromatic hydrocarbons mixture and C4-C8 remove the trimethyl carbinol higher alcohols in any one.
10. the polyoxymethylene dimethyl ether preparation method making alcohol fuel additive as described in claim 1 or 8, is characterized in that: described predrainage process is equipped with in the water knockout of gasoline by proceeding to after the polyoxymethylene dimethyl ether cut of the n=1-2 being less than 100 DEG C within the condenser condensation; The polyoxymethylene dimethyl ether cut of the n=3-6 being greater than 100 DEG C is proceeded to after condensation within the condenser and is equipped with in the water knockout of diesel oil.
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| CN102040490A (en) * | 2009-10-13 | 2011-05-04 | 中国石油化工股份有限公司 | Synthesis method of polyformaldehyde dimethyl ether |
| CN102206552A (en) * | 2011-05-05 | 2011-10-05 | 湖南未名创林生物能源有限公司 | Method and device for preparing biodiesel by vapour, liquid and solid heterogeneous catalysis |
| CN102617305A (en) * | 2012-02-28 | 2012-08-01 | 中国科学院化学研究所 | Process for preparing polyoxymethylene dimethyl ether |
| CN102795967A (en) * | 2011-05-25 | 2012-11-28 | 江苏恒祥化工有限责任公司 | Method for preparing 1, 4-cyclohexanedimethanol from terephthalic acid |
| CN102964227A (en) * | 2012-09-18 | 2013-03-13 | 中国海洋石油总公司 | Method for preparation of polyoxymethylene dimethyl ether from paraformaldehyde |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102040490A (en) * | 2009-10-13 | 2011-05-04 | 中国石油化工股份有限公司 | Synthesis method of polyformaldehyde dimethyl ether |
| CN102206552A (en) * | 2011-05-05 | 2011-10-05 | 湖南未名创林生物能源有限公司 | Method and device for preparing biodiesel by vapour, liquid and solid heterogeneous catalysis |
| CN102795967A (en) * | 2011-05-25 | 2012-11-28 | 江苏恒祥化工有限责任公司 | Method for preparing 1, 4-cyclohexanedimethanol from terephthalic acid |
| CN102617305A (en) * | 2012-02-28 | 2012-08-01 | 中国科学院化学研究所 | Process for preparing polyoxymethylene dimethyl ether |
| CN102964227A (en) * | 2012-09-18 | 2013-03-13 | 中国海洋石油总公司 | Method for preparation of polyoxymethylene dimethyl ether from paraformaldehyde |
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