AU2020101401A4 - System and Method for Preparing Methanol Therewith - Google Patents

System and Method for Preparing Methanol Therewith Download PDF

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AU2020101401A4
AU2020101401A4 AU2020101401A AU2020101401A AU2020101401A4 AU 2020101401 A4 AU2020101401 A4 AU 2020101401A4 AU 2020101401 A AU2020101401 A AU 2020101401A AU 2020101401 A AU2020101401 A AU 2020101401A AU 2020101401 A4 AU2020101401 A4 AU 2020101401A4
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methanol
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Mao GONG
Lianhui ZHOU
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
    • C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
    • C01B3/04—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by decomposition of inorganic compounds, e.g. ammonia
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/50—Carbon dioxide
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
    • C07C29/15—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
    • C07C29/15—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively
    • C07C29/151—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively with hydrogen or hydrogen-containing gases
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
    • C07C29/15—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively
    • C07C29/151—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively with hydrogen or hydrogen-containing gases
    • C07C29/152—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively with hydrogen or hydrogen-containing gases characterised by the reactor used
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C31/00—Saturated compounds having hydroxy or O-metal groups bound to acyclic carbon atoms
    • C07C31/02—Monohydroxylic acyclic alcohols
    • C07C31/04—Methanol
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P1/00—Preparation of compounds or compositions, not provided for in groups C12P3/00 - C12P39/00, by using microorganisms or enzymes
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/02—Hydrogen or oxygen
    • C25B1/04—Hydrogen or oxygen by electrolysis of water
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis

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Abstract

The invention discloses a system and method for preparing methanol therewith. The oxygen output end of the water electrolyzing reactor is connected to the fermentation pool, the hydrogen output end of the water electrolyzing reactor is connected to the methanol synthesizing gas compressor, and the output end of the fermentation pool is connected to the methanol synthesizing gas compressor, the output end of which is connected to the first input end of the tower gas preheater, the first output end of which is connected to the first input end of the methanol synthesizing tower, and the output end of which is connected to the tower gas preheater, the second input end of which is connected to the methanol condenser, whose output end is connected to the methanol separator, whose output end is connected to the methanol expansion tank, whose output end is connected to the booster pump, the output end of which is connected to the second input end of the methanol synthesizing tower. 1

Description

System and Method for Preparing Methanol Therewith
Technical field:
The present invention relates to the field of chemical technology, in particular to a system and
method for producing methanol.
Arts of Background
As an important organic chemical raw material and high-quality fuel, methanol is widely used in
fine chemicals, plastics, pharmaceuticals, wooden products processing and other industries, which
and half of whose output are produced for the formaldehyde, a kind of indispensable raw materials
for manufacturing various synthetic resins. Methanol could be utilized as a methylated reagent to
produce methyl acrylate, dimethyl terephthalate, methylamine, methylaniline, methane chloride,
etc.; methanol carbonylation can produce acetic acid, acetic anhydride, methyl formate and other
important organic synthetic intermediates, which are the raw materials for preparing various
dyestuffs, pharmaceuticals, pesticides, explosives, spices, spray paint; synthesizing ethylene
glycol, acetaldehyde and ethanol from methanol is also highlighted with more and more attention.
Methanol can be, not only as an essential organic solvent with better solubility than ethanol, used
for preparing paint, but also as an excellent extractant, used for separating some substances in
analytical chemistry.
As a promising clean energy too, methanol fuel has many advantages such as safety, cheapness,
full combustion and environmental-friendliness, which is panning out alternative vehicular fuel to
substitute gasoline; in addition, the fuel-grade methanol for heating and power generating meets
environmental protection requirements. Methanol could be biologically fermented into methanol
albumen, which is rich in vitamins and proteins with advantages of high nutritional value, low cost
and wide spectrums of application like fodder additive.
The extant method for preparing methanol is of synthesis, following the chemical reaction formula:
C0 2+ 3H 2= CH 30H+ H20+Q
wherein, Q denotes the heat produced amid reaction.
Such method for producing CO2 not only takes the organic waste into no account; but also lack of
the various devices being integrated into the overall system reasonably for lowering process steps
and costs; what is more, the by-products generated by and during the preparation processing are
not fully recycled, valuable resources of which are wasting away.
Summary of the Invention:
The present invention of a system and method for preparing methanol therewith is disclosed to
resolve the deficiencies of the prior art.
The invention comprises: a water electrolyzing reactor for preparing hydrogen, a fermentation
pool for preparing C0 2, a gas compressor for synthesizing methanol, a tower gas preheater, a
methanol synthesizing tower, methanol condensers, a methanol separator, a methanol expansion
tank, a booster pump,
the oxygen output end of the water electrolyzing reactor is connected to a fermentation pool, and
the hydrogen output end of the water electrolyzing reactor is connected to a compressor for
synthesizing methanol gas, the output end of the fermentation pool is connected to a compressor
for methanol gas synthesizing, the output end of which is connected to a first input end of a tower
gas preheater, and the first output end of which is connected to the first input end of the methanol
synthesizing tower, the output end of which is connected to the second input end of the tower gas
preheater, the second output end of which is connected to methanol condensers, and the output end
of which is connected to a methanol separator, the output end of which is connected to a methanol
expansion tank, the output end of the methanol expansion tank is connected to a booster pump,
and the output end of which is connected to the second input end of the methanol synthesizing
tower.
Preferably, the methanol synthesizing tower is a tube-arrayed isothermal reactor with the XNC-98
type of methanol synthetic catalyst inside the tube and boiling boiler water outside the tube.
Preferably, the methanol condensers are the methanol condenser A and the methanol condenser B
interconnected in parallel.
Preferably, the methanol separator is also provided with a purge gas outlet, which is connected to a
gas power generating equipment.
Preferably, the methanol expansion tank is also provided with an expansion gas outlet, which is
connected to a fuel gas device.
A method for preparing methanol comprises the following steps:
the water in the water electrolyzing reactor is electrolyzed to generate hydrogen and oxygen, and
the generated oxygen is feed into the fermentation pool retaining organic waste for producing C0 2
, which, together with hydrogen, are compressed by the gas compressor for synthesizing methanol
to 5.14MPa, and heated to 225C by the gas preheater, finally entering the methanol synthesizing
tower, in which, by the catalyst activating, the synthetic reaction is taking place as following:
C0 2 + 3H 2 = CH3 0H+ H 20 + Q
The synthetic gas with 255°C and 4.9 MPa out of the methanol synthesizing tower is processed
with the sequence: the tower gas preheater, the methanol condenser and the methanol separator, in
which. the crude methanol is separated, entering the methanol expansion tank, and depressurized
to 0.4 MPa, finally is exported to a distillation equipment for treatment with the end product of
refined methanol.
Preferably, the methanol separator also outputs some circulative gas, before pressurized by the
booster pump, partial purge gas is discharged and exported to the gas-fired power generation
system after decompressed; the expanding gas emitted from the top of the methanol expansion
tank goes to the fuel gas device.
Preferably, the methanol separator also separates the mixed gas and the fresh gas, both of which
are mixed in certain proportion, and via the booster pump, are exported to the methanol
synthesizing tower for continuous synthesizing reaction.
The present invention has the below advantages:
1. taking full use of organic waste, which, as raw material resources, produces CO 2;
2. the equipments in the system of the present invention are orderly integrated; for instance, the
hydrogen produced by the reactor is one of the chemical reactants for preparing methanol, and
the oxygen and organic waste in the fermentation pool in combination produce CO 2; one
equipment alone produce two kinds of essential reactants without installing other equipments
reducing the costs and processing steps.
Experimental data shows that oxygen plays important role for the organic waste composting. if
supplying the sufficient amount of oxygen, most of the carbon is converted into CO 2; if
undersupplying, only a small part of carbon is converted into CO 2 . Supplying sufficient oxygen
is able to accelerate the decomposition of organic matter and the rise of the compost temperature
from onset, able to reduce the composting time and the malodorous gas emitting.
3. The mixed gas and fresh gas separated by the methanol separator are mixed according to a
certain ratio, after boosted by the booster pump, exported to the methanol synthesizing tower for
continuous synthetic reacting. The methanol separator also output some circulative gas; before
pressurized by the booster pump, partial purge gas is discharged and exported to the gas-fired
power generation system after decompressed; the expanding gas emitted from the top of the
methanol expansion tank goes to the fuel gas device. Thus, the by-products during the processing
are fully recycled and reused.
4 Using the clean energy of wind and solar power for electrolyzing water yields green
oxyhydrogen, part of the oxygen is provided to urban and rural organic waste for accelerating its
composting and the capacity of methanol production; the waste resources are reused to their
maximum, which is complying with the modem rule of ecological cycling economy.
Brief description with the accompanying drawing:
In order to more clearly explain the embodiments of the invention or the technical solutions in the
prior art, the following will briefly illustrate the drawings accompanied in the description of the
embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the invention, for those of ordinary skill in the art, without paying any creative work, can also obtain other drawings based on these drawings.
Figure 1 is a schematic structural view of a system for producing methanol according to an
embodiment of the invention.
Detailed Description of the embodiment:
As shown in Fig 1, a system for preparing methanol comprise:
a water electrolyzing reactor 1 for preparing hydrogen, a fermentation pool 2 for preparing C0 2
, a gas compressor 3 for synthesizing methanol, a tower gas preheater 4, a methanol synthesizing
tower 5, a methanol condenser 6, a methanol separator 7, a methanol expansion tank 8, a booster
pump 9, the oxygen output end of the water electrolyzing reactor 1 is connected to the
fermentation pool 2, and the hydrogen output end of the water electrolyzing reactor is connected
to the compressor 3 for synthesizing methanol gas, the output end of the fermentation pool 2 is
connected to the compressor 3 for methanol gas synthesis, the output end of which is connected to
a first input end of a tower gas preheater 4, and the first output end of which is connected to the
first input end of the methanol synthesizing tower 5, the output end of which is connected to the
second input end of the tower gas preheater 4, the second output end of which is connected to a
methanol condenser 6, and the output end of which is connected to a methanol separator 7, the
output end of which is connected to a methanol expansion tank 8, the output end of the methanol
expansion tank 8 is connected to a booster pump 9, and the output end of which is connected to
the second input end of the methanol synthesizing tower 5.
wherein, the methanol synthesizing tower 5 is a tube-arrayed isothermal reactor with the XNC-98
type of methanol synthetic catalyst inside the tube and boiling boiler water outside the tube; the
methanol condenser 6 are the methanol condenser A and the methanol condenser B; the methanol
separator 6 is also provided with a purge gas outlet, which is connected to a gas power generating
equipment; the methanol expansion tank 8 is also provided with an expansion gas outlet, which is
connected to a fuel gas device.
A method for preparing methanol comprises the following steps:
the water in the water electrolyzing reactor 1 is electrolyzed to generate hydrogen and oxygen, and
the generated oxygen is feed into the fermentation pool 2 retaining organic waste for producing
C0 2 , which plus the hydrogen, are compressed to 5.14MPa by the gas compressor 3 for
synthesizing methanol, and heated to 225C via the gas preheater 4, finally entering the methanol
synthesizing tower 5, in which, by the catalyst activating, the synthetic reaction is taking place as
following
C0 2 + 3H 2 = CH3 0H+ H 20 + Q
The synthetic gas with 255°C and 4.9 MPa out of the methanol synthesizing tower 5 is processed
through the sequence of the tower gas preheater 4 and the methanol condenser 6, and exported
into the methanol separator 7, in which, the crude methanol is separated and exported into the
methanol expansion tank 8, and by which, depressurized to 0.4 MPa, until to a distillation
equipment for treatment, obtaining the refined methanol.
In addition, the methanol separator 7 also output some circulative gas, before pressurized by the
booster pump 7, partial purge gas is discharged and exported to the gas-fired power generation
system after decompressed; the expanding gas from the top of the methanol expansion tank 8 is
exported to the fuel gas device; the methanol separator 7 also separates the mixed gas and the
fresh gas, both of which are mixed in certain proportion, and via the booster pump 9, are exported
to the methanol synthesizing tower 5 for continuous synthesizing reaction.
The working principle of the invention is:
the water in the water electrolyzing reactor 1 is electrolyzed to generate hydrogen and oxygen, and
the generated oxygen is feed into the fermentation pool 2 with organic waste for producing C0 2 ,
which plus the hydrogen, are compressed by the gas compressor 3 for synthesizing methanol to
5.14MPa, and via the gas preheater 4, heated to 225°C, finally entering the methanol synthesizing
tower 5, in which, by the catalyst activating, the synthetic reaction is taking place as following:
C0 2+ 3H 2 = CH3 0H+ H 20 + Q
the methanol synthesizing tower 5 is a tube-arrayed isothermal reactor with the XNC-98 type of methanol synthetic catalyst inside the tube and boiling boiler water outside the tube; the huge heat released from the reaction is transmitted to the boiler water via the tube walls, producing large amount of medium pressure and saturated steam with 3.9MPa, which, after decompressed, is transported to the steam tube network. The by-product of steam keeps the reaction in the methanol synthesizing tower 5 in nearing stability, meantime, the pressure of the steam is able to adjust the reactive temperature. The synthetic gas with 255°C and 4.9 MPa out of the methanol synthesizing tower 5 is processed with the sequence of the tower gas preheater 4 and the methanol condensers 6, and exported into the methanol separator 7, in which, the crude methanol is separated out and exported into the methanol expansion tank 8, and by which, depressurized to 0.4 MPa, exported to a distillation equipment for treatment, the methanol separator 7 also separates the mixed gas and the fresh gas, both of which are mixed in certain proportion, and via the booster pump 9, are exported to the methanol synthesizing tower 5 for continuous synthesizing reaction; some purge gas of circulative gas from the methanol separator 7 is discharged off for keeping the constancy of inertia gas in circulating loop before pressurized, the purge gas is exported to the gas-fired power generation system after decompressed; the expanding gas emitted from the top of the methanol expansion tank 8 is exported to the fuel gas device.
The above-mentioned of the invention are just preferred embodiments and are not confined to
such scopes of the invention. Any modification, equivalent replacement, improvement, etc. made
within the spirit and principle of the invention should be fallen into the protective scope of the
invention.

Claims (8)

  1. Claims
    A system for preparing methanol comprises: a water electrolyzing reactor 1 for preparing
    hydrogen, a fermentation pool 2 for preparing C0 2, a gas compressor 3 for synthesizing methanol,
    a tower gas preheater 4, a methanol synthesizing tower 5, methanol condensers 6, a methanol
    separator 7, a methanol expansion tank 8, a booster pump 9, the oxygen output end of the water
    electrolyzing reactor 1 is connected to the fermentation pool 2, and the hydrogen output end of the
    water electrolyzing reactor is connected to the compressor 3 for synthesizing methanol gas, the
    output end of the fermentation pool 2 is connected to the compressor 3 for methanol gas
    synthesizing, the output end of which is connected to a first input end of a tower gas preheater 4,
    and the first output end of which is connected to the first input end of the methanol synthesizing
    tower 5, the output end of which is connected to the second input end of the tower gas preheater 4,
    the second output end of which is connected to a methanol condenser 6, and the output end of
    which is connected to a methanol separator 7,the output end of which is connected to a methanol
    expansion tank 8, the output end of the methanol expansion tank 8 is connected to a booster pump
    9, and the output end of which is connected to the second input end of the methanol synthesizing
    tower 5.
  2. 2. A system for preparing methanol according to claim 1, wherein the methanol synthesizing
    tower (5) is a tube-arrayed isothermal reactor with the XNC-98 type of methanol synthetic catalyst
    inside the tube and boiling boiler water outside the tube.
  3. 3 A system for preparing methanol according to claim 1, wherein the methanol condensers (6)
    are the methanol condenser A and the methanol condenser B interconnected in parallel.
  4. 4. A system for preparing methanol according to claim 1, wherein the methanol separator (7) is
    also provided with a purge gas outlet, which is connected to a gas-fired power generating
    equipment.
  5. 5. A system for preparing methanol according to claim 1, wherein the methanol expansion tank
    (8) is also provided with an expansion gas outlet, which is connected to a fuel gas device.
  6. 6. A method for preparing methanol comprises the following steps:
    the water in the water electrolyzing reactor (1) is electrolyzed to generate hydrogen and oxygen,
    and the generated oxygen is feed into the fermentation pool (1) retaining organic waste for producing CO 2 , which, together with hydrogen, are compressed to 5.14MPa by the gas compressor (3) for synthesizing methanol and heated to 225C by the gas preheater (4), finally entering the methanol synthesizing tower (5), in which, by the catalyst activating, the synthetic reaction is taking place as following:
    C0 2 + 3H 2 = CH3 0H+ H 20 + Q
    the synthetic gas with 255°C and 4.9 MPa out of the methanol synthesizing tower (5) is processed
    through the following sequences: the tower gas preheater (4), the methanol condenser (6) and the
    methanol separator (7), in which. the crude methanol is separated and exported to the methanol
    expansion tank (8), and depressurized to 0.4 MPa, finally is exported to a distillation equipment
    for treatment with the end product of refined methanol.
  7. 7. A method for preparing methanol according to claim 6, wherein the methanol separator (7) also
    output some circulative gas, some of which, before pressurized by the booster pump (9), is
    discharged, decompressed, and exported to the gas-fired power generation system; the expanding
    gas emitted from the top of the methanol expansion tank (8) goes to the fuel gas system.
  8. 8. A method for preparing methanol according to claim 6, the methanol separator (7) also
    separates out the mixed gas and the fresh gas, both of which are mixed in certain proportion, and
    via the booster pump (9) exported to the methanol synthesizing tower (5) for continuous
    synthesizing reaction.
    Editorial Note 2020101401 There is only one page of the drawing
AU2020101401A 2020-06-19 2020-07-17 System and Method for Preparing Methanol Therewith Ceased AU2020101401A4 (en)

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AUPCT/CN2020/096980 2020-06-19

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