Method for preparing hydrogen-rich synthesis gas by using sodium lignin sulfonate

Abstract

The invention relates to a method for preparing hydrogen-rich synthesis gas by using sodium lignin sulfonate. The method comprises the following steps: adjusting the pH value of a sodium lignin sulfonate solution to 1-3, adding a Pt-based catalyst, introducing gas until the pressure reaches 1.5-3 MPa, and carrying out a water-phase reforming reaction to obtain the hydrogen-rich synthesis gas. According to the method, the pH value of the sodium lignin sulfonate solution is adjusted to a specific range, and a Pt-based catalyst is added, so that efficient decomposition and conversion of the sodium lignin sulfonate under a water phase reforming condition can be realized, and the hydrogen-rich synthesis gas is obtained. According to the method, efficient conversion from the sodium lignin sulfonate waste liquid to the hydrogen-rich synthesis gas can be achieved, and a new way is provided for high-value resource utilization of the sodium lignin sulfonate waste liquid under the background that the sodium lignin sulfonate waste liquid is difficult to recycle and poor in economical efficiency at present.

Description

Technical Field

[0001] The present invention relates to the field of waste liquid resource utilization, and more specifically, to a method for preparing hydrogen-rich synthesis gas by utilizing sodium lignin sulfonate. Background Art

[0002] Sulfite pulping is an important chemical pulping method. The pulp produced is lighter in color and can be directly used to produce many types of paper without bleaching. The pulp has high purity, is easy to further process and refine, and has low production cost. Sodium lignin sulfonate produced in the sulfite pulping process is one of the main by-products, usually in the form of sodium lignin sulfonate waste liquid. Direct discharge of sodium lignin sulfonate waste liquid will cause serious environmental pollution, so it needs to be recycled.

[0003] The existing sodium lignin sulfonate waste liquid treatment processes are mainly divided into two categories. One is to recover heat energy and inorganic chemicals by concentrating and burning the waste liquid, and the other is to process the waste liquid as raw material into sodium lignin sulfonate derivatives. The most common ones are prepared into adhesives, water reducers, dispersants, etc. through processes such as concentration and spray drying. Since there are many impurities in the sodium lignin sulfonate waste liquid, the purity of sodium lignin sulfonate is limited, and its purification process is complicated and economical, only low-level recycling can be achieved. In general, there is a lack of better sodium lignin sulfonate waste liquid recycling and treatment methods.

[0004] Aqueous phase reforming is a process in which raw materials are converted into hydrogen-rich synthesis gas in the liquid phase using a catalyst. Usually, the reaction pressure inside the reactor is higher than the saturated vapor pressure of the solvent at the reaction temperature to ensure that the reactants are in the liquid phase solvent during the reaction. The hydrogen content in the hydrogen-rich synthesis gas is an important criterion for evaluating the quality of the synthesis gas. The higher the hydrogen content of the hydrogen-rich synthesis gas, the higher the total heat of the synthesis gas. Aqueous phase reforming technology has received widespread attention due to its simple process, low reaction temperature, generally high energy efficiency, and the gas product has a certain pressure. If sodium lignin sulfonate waste liquid can be used as a raw material and hydrogen-rich synthesis gas with a high hydrogen content can be produced through aqueous phase reforming, high-value recycling of sodium lignin sulfonate waste liquid can be achieved.

[0005] A Chinese patent entitled "A method for preparing alkane fuel from lignin and its application" discloses that alkane dyes can be prepared using sodium lignin sulfonate as a raw material in combination with a metal catalyst. The patent mainly focuses on the content of alkane products in the alkane dyes, and does not focus on the content of hydrogen.

[0006] Therefore, it is necessary to develop a technology for preparing hydrogen-rich synthesis gas using sodium lignin sulfonate as raw material to improve the recycling value of sodium lignin sulfonate waste liquid. Summary of the invention

[0007] The purpose of the present invention is to overcome the problem that the recycling value of the above-mentioned existing sodium lignin sulfonate waste liquid is not high or the technology for preparing hydrogen-rich synthesis gas using sodium lignin sulfonate as raw material is relatively lacking, and provide a method for preparing hydrogen-rich synthesis gas using sodium lignin sulfonate. The method adjusts the pH of the sodium lignin sulfonate solution to a specific range (1-3) and adds a Pt-based catalyst, which can achieve efficient decomposition and conversion of sodium lignin sulfonate under aqueous phase reforming conditions to obtain hydrogen-rich synthesis gas. The method can achieve efficient conversion of sodium lignin sulfonate waste liquid into hydrogen-rich synthesis gas, and under the background of the current difficulty in recycling and poor economic efficiency of sodium lignin sulfonate waste liquid, it provides a new way for the high-value resource utilization of sodium lignin sulfonate waste liquid.

[0008] The above-mentioned object of the present invention is achieved by the following technical solutions:

[0009] A method for preparing hydrogen-rich synthesis gas using sodium lignin sulfonate comprises the following steps:

[0010] The pH of the sodium lignin sulfonate solution is adjusted to 1-3, a Pt-based catalyst is added, and gas is introduced to reach 1.5-3 MPa, and then an aqueous phase reforming reaction is carried out to obtain hydrogen-rich synthesis gas.

[0011] The inventors of the present invention have found that when sodium lignin sulfonate is used as a raw material and aqueous phase reforming technology is used to prepare synthesis gas, the conversion rate of sodium lignin sulfonate is low and the generated gas contains only a trace amount of hydrogen. The reason may be that the molecular structure of sodium lignin sulfonate is relatively stable and difficult to be converted into gas.

[0012] The inventors of the present invention further discovered that, by using sodium lignin sulfonate as a raw material, adding a Pt-based catalyst and then conducting an aqueous phase reforming reaction, the conversion rate of sodium lignin sulfonate is improved to a certain extent, but the increase is not large, and the hydrogen content of the resulting synthesis gas is low.

[0013] After repeated studies, it was found that by adjusting the pH of the sodium lignin sulfonate solution to a specific range (1-3), aerating and pressurizing (1.5-3MPa) and adding a Pt-based catalyst, the sodium lignin sulfonate can be efficiently decomposed and converted under aqueous phase reforming conditions to obtain hydrogen-rich synthesis gas. The reason may be that the acidic conditions in the specific pH range and the Pt metal active sites of the Pt-based catalyst have a synergistic effect, which jointly promotes the decomposition of sodium lignin sulfonate and the generation of hydrogen-rich synthesis gas, thereby significantly improving the conversion rate of sodium lignin sulfonate, the total gas yield and the hydrogen yield; in addition, the hydrogen content in the hydrogen-rich synthesis gas can also be increased. Specifically, the conversion rate of sodium lignin sulfonate reaches more than 22.43%, the hydrogen yield is more than 0.79mmol / g, and the total gas yield is more than 5.83mmol / g. The method provided by the present invention solves the problem of low conversion rate of sodium lignin sulfonate in aqueous phase reforming, and can realize efficient conversion of sodium lignin sulfonate waste liquid into hydrogen-rich synthesis gas. Under the background that the recycling and utilization of sodium lignin sulfonate waste liquid is difficult and the economic efficiency is poor, a new way is provided for the high-value resource utilization of sodium lignin sulfonate waste liquid.

[0014] If the pH is too high (higher than 3), the synergistic effect of the acidic conditions and the Pt metal active sites of the Pt-based catalyst is not obvious, and the conversion rate of sodium lignin sulfonate, the total gas yield, the hydrogen yield, and the hydrogen content in the hydrogen-rich synthesis gas cannot be significantly improved. If the pH is too low (lower than 1), sodium lignin sulfonate is easily precipitated from the solution, and the conversion rate of sodium lignin sulfonate, the total gas yield, the hydrogen yield, and the hydrogen content in the hydrogen-rich synthesis gas are not high. If only the pH is adjusted to 1 to 3, but no Pt-based catalyst is added, there is no synergistic effect of the acidic conditions and the Pt metal active sites of the Pt-based catalyst, and the conversion rate of sodium lignin sulfonate, the total gas yield, and the hydrogen yield are not high.

[0015] Preferably, the concentration of sodium lignin sulfonate in the sodium lignin sulfonate solution is not higher than 20 wt %.

[0016] More preferably, the concentration of sodium lignin sulfonate in the sodium lignin sulfonate solution is 2 to 20 wt %, and further preferably 2 to 6 wt %.

[0017] Preferably, the sodium lignin sulfonate solution is sodium lignin sulfonate waste liquor from a sulfite pulping process.

[0018] Preferably, the pH of the sodium lignin sulfonate solution is adjusted to 1-3 using sulfuric acid.

[0019] Preferably, the pH of the sodium lignin sulfonate solution is adjusted to 1 to 2. When the pH is adjusted to 1 to 2, the synergistic effect of the acidic conditions and the Pt-based catalyst is better, and the conversion rate of sodium lignin sulfonate, the hydrogen yield, the total gas yield, and the proportion of hydrogen content in the hydrogen-rich synthesis gas are all higher. Further preferably, when the pH is adjusted to 1, each performance index is optimal.

[0020] Preferably, the Pt-based catalyst is a supported catalyst.

[0021] More preferably, the Pt loading in the supported catalyst is 0.1 to 20 wt %.

[0022] More preferably, the carrier of the supported catalyst is at least one of Al2O3, C (carbon) or SiO2.

[0023] Preferably, the amount of the Pt-based catalyst is as follows: based on the mass of sodium lignin sulfonate, 0.1 to 1 g of the Pt-based catalyst is added for every 1 g of sodium lignin sulfonate.

[0024] Preferably, the gas is at least one of an inert gas or hydrogen.

[0025] More preferably, the inert gas is at least one of nitrogen, argon or helium.

[0026] Preferably, the pressure of the introduced gas reaches 2-3 MPa.

[0027] Preferably, the reaction temperature of the aqueous phase reforming reaction is 200-260° C., and the reaction time is 2-12 hours.

[0028] More preferably, the reaction temperature of the aqueous phase reforming reaction is 230-260° C., and the reaction time is 6-12 hours.

[0029] By regulating the temperature and time of the aqueous phase reforming reaction, the conversion rate of sodium lignin sulfonate, the hydrogen yield, the total gas yield, and the proportion of hydrogen content in the hydrogen-rich synthesis gas can be increased.

[0030] Preferably, the molar percentage of hydrogen in the hydrogen-rich synthesis gas is greater than 12%.

[0031] More preferably, the molar percentage of hydrogen in the hydrogen-rich synthesis gas is 15-42%.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The method of the present invention adjusts the pH of the sodium lignin sulfonate solution to a specific range (1-3) and adds a Pt-based catalyst, so that the sodium lignin sulfonate can be efficiently decomposed and converted under aqueous phase reforming conditions to obtain hydrogen-rich synthesis gas. The method can realize the efficient conversion of sodium lignin sulfonate waste liquid into hydrogen-rich synthesis gas, and provides a new way for the high-value resource utilization of sodium lignin sulfonate waste liquid under the background that the sodium lignin sulfonate waste liquid is difficult to recycle and has poor economic efficiency. DETAILED DESCRIPTION

[0034] In order to more clearly and completely describe the technical solution of the present invention, the present invention is further described in detail through specific embodiments below. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention. Various changes can be made within the scope of the rights of the present invention.

[0035] Example 1

[0036] This embodiment provides a method for preparing hydrogen-rich synthesis gas using sodium lignin sulfonate, comprising the following steps:

[0037] Sulfuric acid is added to a 6wt% sodium lignin sulfonate solution (prepared in-house, by weighing sodium lignin sulfonate and adding it to water) to adjust the pH value to 1; the sodium lignin sulfonate solution after adjusting the pH value is placed in a hydrothermal reactor, and then 0.5g of Pt / Al2O3 catalyst (the Pt loading is 5%) is added for every 1g of sodium lignin sulfonate based on the mass of the sodium lignin sulfonate; the air in the hydrothermal reactor is replaced by high-pressure N2 and the pressure of the hydrothermal reactor is adjusted to 2MPa, the hydrothermal reactor is heated to 230°C, the reaction is carried out for 12h, and the collected gas product is hydrogen-rich synthesis gas.

[0038] After the reaction is completed, the residual sodium lignin sulfonate in the solution in the hydrothermal reactor is precipitated and quantified, and the gas product is quantitatively analyzed by gas chromatography. After measurement and calculation, the conversion rate of sodium lignin sulfonate in this embodiment is 82.68%, the hydrogen yield is 5.92 mmol / g, and the total gas yield is 14.58 mmol / g.

[0039] The conversion rate of sodium lignin sulfonate = 1-(the amount of sodium lignin sulfonate precipitate after the reaction / the mass of sodium lignin sulfonate before the reaction), the same below;

[0040] Hydrogen yield = hydrogen molar yield after reaction / mass of sodium lignin sulfonate before reaction, the same below;

[0041] Total gas yield = total molar gas yield after reaction / mass of sodium lignin sulfonate before reaction, the same below.

[0042] Example 2

[0043] This embodiment provides a method for preparing hydrogen-rich synthesis gas using sodium lignin sulfonate, comprising the following steps:

[0044] Sulfuric acid is added to a 2wt% sodium lignin sulfonate solution (prepared in-house, by weighing sodium lignin sulfonate and adding it to water) to adjust the pH value to 1; the sodium lignin sulfonate solution after adjusting the pH value is placed in a hydrothermal reactor, and then 0.5g of Pt / C catalyst (the Pt loading is 5%) is added for every 1g of sodium lignin sulfonate based on the mass of the sodium lignin sulfonate; the air in the hydrothermal reactor is replaced by high-pressure Ar and the pressure of the hydrothermal reactor is adjusted to 3MPa, the hydrothermal reactor is heated to 260°C, the reaction is carried out for 6h, and the collected gas product is hydrogen-rich synthesis gas.

[0045] After the reaction, the residual sodium lignin sulfonate in the solution in the hydrothermal reactor was precipitated and quantified, and the gas product was quantitatively analyzed by gas chromatography. After measurement and calculation, the conversion rate of sodium lignin sulfonate in this embodiment was 87.82%, the hydrogen yield was 6.73 mmol / g, and the total gas yield was 16.37 mmol / g.

[0046] Example 3

[0047] This embodiment provides a method for preparing hydrogen-rich synthesis gas using sodium lignin sulfonate, comprising the following steps:

[0048] Sulfuric acid is added to a 6wt% sodium lignin sulfonate solution (prepared in-house, by weighing sodium lignin sulfonate and adding it to water) to adjust the pH value to 1; the sodium lignin sulfonate solution after adjusting the pH value is placed in a hydrothermal reactor, and then 0.5g of Pt / Al2O3 catalyst (the Pt loading is 20%) is added for every 1g of sodium lignin sulfonate based on the mass of the sodium lignin sulfonate; the air in the hydrothermal reactor is replaced by high-pressure N2 and the pressure of the hydrothermal reactor is adjusted to 2MPa, the hydrothermal reactor is heated to 230°C, the reaction is carried out for 2h, and the collected gas product is hydrogen-rich synthesis gas.

[0049] After the reaction is completed, the residual sodium lignin sulfonate in the solution in the hydrothermal reactor is precipitated and quantified, and the gas product is quantitatively analyzed by gas chromatography. After measurement and calculation, the conversion rate of sodium lignin sulfonate in this embodiment is 72.82%, the hydrogen yield is 5.11 mmol / g, and the total gas yield is 13.41 mmol / g.

[0050] Example 4

[0051] This embodiment provides a method for preparing hydrogen-rich synthesis gas using sodium lignin sulfonate, comprising the following steps:

[0052] Sulfuric acid is added to a 2wt% sodium lignin sulfonate solution (prepared in-house, by weighing sodium lignin sulfonate and adding it to water) to adjust the pH value to 1; the sodium lignin sulfonate solution after adjusting the pH value is placed in a hydrothermal reactor, and then 0.5g of Pt / Al2O3 catalyst (the Pt loading is 1%) is added for every 1g of sodium lignin sulfonate based on the mass of the sodium lignin sulfonate; the air in the hydrothermal reactor is replaced by high-pressure Ar and the pressure of the hydrothermal reactor is adjusted to 2MPa, the hydrothermal reactor is heated to 230°C, the reaction is carried out for 2h, and the collected gas product is hydrogen-rich synthesis gas.

[0053] After the reaction, the residual sodium lignin sulfonate in the solution in the hydrothermal reactor was precipitated and quantified, and the gas product was quantitatively analyzed by gas chromatography. After measurement and calculation, the conversion rate of sodium lignin sulfonate in this embodiment was 56.37%, the hydrogen yield was 3.69 mmol / g, and the total gas yield was 11.43 mmol / g.

[0054] Example 5

[0055] This embodiment provides a method for preparing hydrogen-rich synthesis gas using sodium lignin sulfonate, comprising the following steps:

[0056] Sulfuric acid is added to a 6wt% sodium lignin sulfonate solution (prepared in-house, by weighing sodium lignin sulfonate and adding it to water) to adjust the pH value to 1; the sodium lignin sulfonate solution after adjusting the pH value is placed in a hydrothermal reactor, and then 0.5g of Pt / C catalyst (the Pt loading is 0.1%) is added for every 1g of sodium lignin sulfonate based on the mass of the sodium lignin sulfonate; the air in the hydrothermal reactor is replaced by high-pressure H2 and the pressure of the hydrothermal reactor is adjusted to 1.5MPa, the hydrothermal reactor is heated to 200°C, and the reaction is carried out for 2h, and the collected gas product is hydrogen-rich synthesis gas.

[0057] After the reaction is completed, the residual sodium lignin sulfonate in the solution in the hydrothermal reactor is precipitated and quantified, and the gas product is quantitatively analyzed by gas chromatography. After measurement and calculation, the conversion rate of sodium lignin sulfonate in this embodiment is 22.43%, the hydrogen yield is 0.91 mmol / g, and the total gas yield is 5.83 mmol / g.

[0058] Example 6

[0059] This embodiment provides a method for preparing hydrogen-rich synthesis gas using sodium lignin sulfonate, comprising the following steps:

[0060] Sulfuric acid is added to a 20wt% sodium lignin sulfonate solution (prepared in-house, by weighing sodium lignin sulfonate and adding it to water) to adjust the pH value to 3; the sodium lignin sulfonate solution after adjusting the pH value is placed in a hydrothermal reactor, and then 0.5g of Pt / SiO2-Al2O3 catalyst (the Pt loading is 5%) is added for every 1g of sodium lignin sulfonate based on the mass of the sodium lignin sulfonate; the air in the hydrothermal reactor is replaced by high-pressure gas (90% N2+10% He) and the pressure of the hydrothermal reactor is adjusted to 2MPa, the hydrothermal reactor is heated to 230°C, the reaction is carried out for 2h, and the collected gas product is hydrogen-rich synthesis gas.

[0061] After the reaction is completed, the residual sodium lignin sulfonate in the solution in the hydrothermal reactor is precipitated and quantified, and the gas product is quantitatively analyzed by gas chromatography. After measurement and calculation, the conversion rate of sodium lignin sulfonate in this embodiment is 25.85%, the hydrogen yield is 0.79 mmol / g, and the total gas yield is 6.59 mmol / g.

[0062] Example 7

[0063] Sulfuric acid is added to about 6wt% sodium lignin sulfonate waste liquid (from a sulfite pulping process production line) to adjust the pH value to 1; the sodium lignin sulfonate waste liquid after the pH value is adjusted is placed in a hydrothermal reactor, and then about 0.5g of Pt / Al2O3 catalyst (Pt loading is 5%) is added for every 1g of sodium lignin sulfonate based on the mass of sodium lignin sulfonate; the air in the hydrothermal reactor is replaced by high-pressure N2 and the pressure of the hydrothermal reactor is adjusted to 2MPa, the hydrothermal reactor is heated to 230°C, the reaction is carried out for 12h, and the collected gas product is hydrogen-rich synthesis gas.

[0064] After the reaction is completed, the residual sodium lignin sulfonate in the waste liquid in the hydrothermal reactor is precipitated and quantified, and the gas product is quantitatively analyzed by gas chromatography. After measurement and calculation, the hydrogen yield of this embodiment is about 6.53 mmol / g, and the total gas yield is about 15.95 mmol / g.

[0065] Comparative Example 1

[0066] This comparative example provides a method for preparing synthesis gas using sodium lignin sulfonate, comprising the following steps:

[0067] A 6wt% sodium lignin sulfonate solution (prepared in-house by weighing sodium lignin sulfonate and adding it to water) was placed in a hydrothermal reactor, and then about 0.5g of Pt / Al2O3 catalyst (Pt loading was 5%) was added per 1g of sodium lignin sulfonate, based on the mass of the sodium lignin sulfonate; the air in the hydrothermal reactor was replaced by high-pressure N2 and the pressure of the hydrothermal reactor was adjusted to 2MPa, the hydrothermal reactor was heated to 230°C, the reaction was carried out for 12h, and the collected gas product was synthesis gas.

[0068] After the reaction, the residual sodium lignin sulfonate in the solution in the hydrothermal reactor was precipitated and quantified, and the gas product was quantitatively analyzed by gas chromatography. After measurement and calculation, the conversion rate of sodium lignin sulfonate in this comparative example was 9.84%, the hydrogen yield was 0.08 mmol / g, and the total gas yield was 4.35 mmol / g.

[0069] Comparative Example 2

[0070] This comparative example provides a method for preparing synthesis gas using sodium lignin sulfonate, comprising the following steps:

[0071] Sulfuric acid is added to a 6wt% sodium lignin sulfonate solution (prepared in-house by weighing sodium lignin sulfonate and adding it to water) to adjust the pH value to 1; the sodium lignin sulfonate solution after adjusting the pH value is placed in a hydrothermal reactor; the air in the hydrothermal reactor is replaced by high-pressure N2 and the pressure of the hydrothermal reactor is adjusted to 2MPa, the hydrothermal reactor is heated to 230°C, the reaction is carried out for 12 hours, and the collected gas product is synthesis gas.

[0072] After the reaction, the residual sodium lignin sulfonate in the solution in the hydrothermal reactor was precipitated and quantified, and the gas product was quantitatively analyzed by gas chromatography. After measurement and calculation, the conversion rate of sodium lignin sulfonate in this comparative example was 14.09%, the hydrogen yield was 0.46 mmol / g, and the total gas yield was 3.90 mmol / g.

[0073] Comparative Example 3

[0074] This comparative example provides a method for preparing synthesis gas using sodium lignin sulfonate, comprising the following steps:

[0075] A 6 wt% sodium lignin sulfonate solution (self-made, weighed sodium lignin sulfonate and added to water) was placed in a hydrothermal reactor, the air in the hydrothermal reactor was replaced by high-pressure N2 and the pressure of the hydrothermal reactor was adjusted to 2 MPa, the hydrothermal reactor was heated to 230°C, and the reaction was carried out for 12 hours. The collected gas product was synthesis gas.

[0076] After the reaction, the residual sodium lignin sulfonate in the solution in the hydrothermal reactor was precipitated and quantified, and the gas product was quantitatively analyzed by gas chromatography. After measurement and calculation, the conversion rate of sodium lignin sulfonate in this comparative example was 2.53%, the hydrogen yield was 0.02 mmol / g, and the total gas yield was 0.32 mmol / g.

[0077] It can be seen from Examples 1 to 7 that by using the method of the present invention to treat the sodium lignin sulfonate solution, the conversion rate of sodium lignin sulfonate can reach more than 22.43%, the hydrogen yield is more than 0.79 mmol / g, and the total gas yield is more than 5.83 mmol / g, indicating that the method of the present invention can achieve efficient decomposition and conversion of sodium lignin sulfonate under aqueous phase reforming conditions to obtain hydrogen-rich synthesis gas.

[0078] It can be seen from Example 1, Comparative Example 1 and Comparative Example 2 that if only a Pt-based catalyst is added but the pH of the sodium lignin sulfonate solution is not adjusted within a specific range (Comparative Example 1), or only the pH of the sodium lignin sulfonate solution is adjusted within a specific range but no Pt-based catalyst is added (Comparative Example 2), the conversion rate of sodium lignin sulfonate, the hydrogen yield and the total gas yield are all low.

[0079] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A method for preparing hydrogen-rich synthesis gas using sodium lignin sulfonate, characterized in that: The steps include: The pH of the sodium lignin sulfonate solution is adjusted to 1-3, a Pt-based catalyst is added, and gas is introduced to reach 1.5-3 MPa, and then an aqueous phase reforming reaction is carried out to obtain hydrogen-rich synthesis gas.

2. The method according to claim 1, characterized in that: The concentration of sodium lignin sulfonate in the sodium lignin sulfonate solution is not higher than 20 wt %.

3. The method according to claim 1, characterized in that: The sodium lignin sulfonate solution is sodium lignin sulfonate waste liquid from a sulfite pulping process.

4. The method according to claim 1, characterized in that: The pH of the sodium lignin sulfonate solution was adjusted to 1-3 using sulfuric acid.

5. The method according to claim 1, characterized in that: The Pt-based catalyst is a supported catalyst.

6. The method according to claim 5, characterized in that: The loading amount of Pt in the supported catalyst is 0.1 to 20 wt %.

7. The method according to claim 5, characterized in that: The carrier of the supported catalyst is at least one of Al2O3, C or SiO2.

8. The method according to claim 1, characterized in that: The gas is at least one of an inert gas or hydrogen.

9. The method according to claim 1, characterized in that: The reaction temperature of the aqueous phase reforming reaction is 200 to 260° C., and the reaction time is 2 to 12 hours.

10. The method according to claim 9, characterized in that: The reaction temperature of the aqueous phase reforming reaction is 230-260° C., and the reaction time is 6-12 hours.