Application of a Titanium Alloy Material in the Electrolytic Synthesis of Succinic Acid

Abstract

The present invention belongs to the field of electrode materials and relates to the application of a titanium alloy material in the electrolytic synthesis of succinic acid. In the application of the present invention, the titanium alloy material is used as a cathode electrode in the electrolytic synthesis of succinic acid; the titanium alloy material is at least one of TC4, TC21, TC4@C, and TC4@N. By applying the titanium alloy material to the electrolytic synthesis of succinic acid, the present invention obtains a corrosion-resistant and low-hydrogen-permeation titanium alloy material that can be applied to the electrolytic synthesis of succinic acid. When the titanium alloy electrode is used for the electrolytic synthesis of succinic acid, a current efficiency of more than 94% can be obtained, and the cell voltage can be reduced; it can effectively replace the lead alloy electrode and avoid lead ion pollution of the succinic acid product; replacing the pure titanium cathode (TA1 and TA2) electrode can reduce the hydrogen permeation of the electrode and further improve the corrosion resistance of the pure titanium electrode, and it can be used as an electrode material for the electrolytic synthesis of succinic acid with high efficiency and energy saving in industrial applications.

Description

Technical Field

[0001] The present invention belongs to the field of electrode materials, and relates to an electrode material used in the industrial production of succinic acid, and particularly to a cathode material for electrolytic synthesis of succinic acid to replace lead alloy electrodes. Background Art

[0002] Succinic acid, commonly known as amber acid, is an important synthetic intermediate for pharmaceuticals and fine chemicals, and is widely used in the synthesis of plastics, rubber, pharmaceuticals, protective coatings and other industries. Succinic acid undergoes a polycondensation reaction with 1,4-butanediol to synthesize polybutylene succinate (PBS). PBS can be used alone as a biodegradable plastic, or can be blended with polybutylene terephthalate (PBAT) and polylactic acid (PLA) to produce biodegradable plastics. With the implementation of the national plastic ban, recently, the domestic market scale of succinic acid is expected to exceed 200,000 tons per year. The main methods for industrial preparation of succinic acid include catalytic hydrogenation reduction of maleic acid (ester), biochemical method and electrolytic reduction method. Among them, the electrolytic method is widely used by domestic and foreign manufacturers and is the main method for the production of succinic acid at home and abroad.

[0003] For the electrolytic synthesis of succinic acid, maleic anhydride or maleic acid is used as the raw material, and succinic acid is synthesized by diaphragm-free electrolysis. The reaction system is 10 wt% sulfuric acid + 1 - 10 wt% maleic acid + 1 - 10% succinic acid. The cathode material for the electrolytic reaction is generally a lead alloy electrode, which has the characteristics of high hydrogen evolution potential and good reaction selectivity. However, in the above system, especially under the condition of a reaction temperature of 60 °C, although the lead alloy is used as the cathode, there is still a certain degree of corrosion. The dissolved lead exists in the electrolyte in the form of lead ions and finally pollutes the product. Titanium electrodes (TA1, TA2) have good corrosion resistance in sulfuric acid systems. As a cathode material to replace lead alloy electrodes, it can avoid the pollution of the product by toxic lead ions. At the same time, as a cathode for electrochemically reducing maleic acid, it exhibits good electrocatalytic characteristics. Its electrocatalytic process is the electrolytic reduction of H + to form TiH x adsorption products, TiH x and maleic acid undergo a hydrogenation reaction to produce succinic acid and Ti; TiH x can effectively improve the activity of the titanium electrode and reduce the cathode polarization potential; however, during the electrolysis process, the titanium electrode forms TiH x adsorbents, and at the same time, it is also easy to form a hydrogen-permeable phase. The hydrogen-permeated TA1 and TA2 will reduce the corrosion resistance of titanium in the medium of 10 wt% sulfuric acid + 1 - 10 wt% maleic acid + 1 - 10% succinic acid, thereby affecting the stability of the titanium electrode, and affecting the process stability, production maintenance and product quality in engineering.

[0004] Therefore, to avoid the lead ion pollution caused by electrode corrosion in the industrial electrolytic synthesis of succinic acid using lead alloy cathodes, as well as problems such as electrode corrosion caused by hydrogen permeation in pure titanium cathodes, developing or finding new cathode materials, or reducing the hydrogen permeation amount of titanium alloys and improving the corrosion resistance of pure titanium electrodes to increase the service life of titanium electrodes is of great practical significance for improving the production process technology stability and product quality in the industrial electrolytic synthesis of succinic acid. Summary of the Invention

[0005] The main object of the present invention is to provide a cathode material in the industrial electrolytic production of succinic acid, replacing the lead alloy electrode with a low-hydrogen-permeation titanium alloy electrode to solve the problems that the existing lead alloy electrodes are prone to corrosion, resulting in the pollution of products by dissolved lead ions; and to solve the problem that the pure titanium electrode as the cathode has serious hydrogen permeation, accelerating the corrosion of the pure titanium electrode.

[0006] To achieve the above invention object, the present invention provides the following technical solutions:

[0007] The application of a titanium alloy material in the electrolytic synthesis of succinic acid, wherein the titanium alloy material is used as a cathode electrode in the electrolytic synthesis of succinic acid; the titanium alloy material is one or a combination of untreated or treated Ti-6Al-4V (TC4) titanium alloy, Ti-6Al-2Zr-2Sn-2Mo-1.5Cr-2Nb (TC21) titanium alloy. By adopting the above technical solution, using the titanium alloy material as the cathode in the electrolytic device for the electrolytic synthesis of succinic acid to replace the current lead alloy cathode in the industrial electrolytic synthesis of succinic acid, thereby avoiding the pollution of succinic acid products by lead ions and reducing the electrolytic hydrogen permeation problem of pure titanium (TA1, TA2) cathodes, and improving the corrosion resistance, stability and electrolytic efficiency of the cathode in the electrolytic synthesis of succinic acid.

[0008] Preferably, the treatment includes chemical treatment; more preferably, the chemical treatment includes carburizing treatment and / or nitriding treatment.

[0009] More preferably, the carburizing treatment is to perform carburizing treatment on materials such as TC4 and TC21 by the double glow plasma surface alloying method; the nitriding treatment is to perform nitriding treatment on materials such as TC4 and TC21 by the plasma method.

[0010] Preferably, the titanium alloy material is at least one of TC4, TC21, TC4@C, TC4@N, wherein TC4@C is a titanium alloy material obtained by carburizing treatment on the surface of TC4, and TC4@N is a titanium alloy material obtained by nitriding treatment on the surface of TC4. By adopting the above technical solution, while avoiding the pollution of succinic acid products by lead ions, it can further reduce the electrolytic hydrogen permeation problem of the cathode and further improve the corrosion resistance, stability and electrolytic efficiency of the cathode in the electrolytic synthesis of succinic acid.

[0011] Preferably, the TC4@C (Ti-6Al-4V@C) is TC4 with surface carburization obtained by double glow plasma carburizing on the surface of TC4; the TC4@N (Ti-6Al-4V@N) is TC4 with surface nitriding obtained by plasma nitriding on the surface of TC4. By adopting the above technical solution, after surface modification, TC4@C and TC4@N can further significantly reduce the hydrogen permeation characteristics of TC4 and further improve the corrosion resistance as the electrode material for electrolytic synthesis of titanium succinate alloy.

[0012] Preferably, the electrolytic process for electrolytic synthesis of succinic acid includes: using the titanium alloy material as the cathode electrode, and at least one of an iridium-titanium noble metal coated electrode, a lead alloy electrode, and a titanium substrate lead dioxide electrode as the anode electrode, using maleic anhydride as the raw material, and electrolytically synthesizing succinic acid at a constant current density in a sulfuric acid system; more preferably, the electrolytic temperature is 50 - 80 °C, more preferably 60 °C, and the constant current density is 300 - 800 A / m 2 The electrolysis ends when 50 - 85% of the theoretical electricity is reached; more preferably, the constant current density is 500 A / m 2 ; more preferably, the electrolysis ends when 80% of the theoretical electricity is reached; more preferably, by adopting the above technical solution, after electrolytic synthesis of succinic acid, the electrolyte is cooled to about 20 °C, crystallized for 4 - 10 h, and then filtered and dried to obtain succinic acid, and the current efficiency is 93.5 - 95.5%.

[0013] Preferably, in the application of the titanium alloy material in the electrolytic synthesis of succinic acid, the titanium alloy material is used as the cathode electrode in a net shape or a plate shape.

[0014] Preferably, in the application of the titanium alloy material in the electrolytic synthesis of succinic acid, the electrolytic hydrogen permeation amount of the titanium alloy material after electrolytic synthesis of succinic acid for N (N = 1 - 25) batches is 0.06 wt% - 0.15 wt%. By adopting the above technical solution, when the titanium alloy material is used in the electrolytic synthesis of succinic acid in the present application, it can have a lower hydrogen permeation amount when used as the cathode electrode, so that the cathode material has better corrosion resistance, is more stable, ensures the process stability and product stability of electrolytic synthesis of succinic acid, and reduces the process cost.

[0015] Preferably, in the application of the titanium alloy material in the electrolytic synthesis of succinic acid, in a 10% sulfuric acid aqueous solution of the electrolyte, electrolytic strengthening is carried out at a current density of 12000 A / m 2 for 24 h, and the weight loss of the cathode electrode of the titanium alloy is not higher than 0.25%, which is lower than 50% of that of the pure titanium electrode. When the titanium alloy material is used as the cathode electrode in the electrolytic synthesis of succinic acid in the present application, it has significantly better corrosion resistance than the pure titanium electrode, and further improves the stability of the cathode electrode.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] In view of the engineering and technical problems existing in the production practice of electrolytic synthesis of succinic acid, the present invention proposes an application of a titanium alloy material in the electrolytic synthesis of succinic acid by screening low hydrogen-permeable titanium alloy materials and surface-treated titanium alloy materials, obtaining a low hydrogen-permeable and highly corrosion-resistant titanium alloy electrode material. Applying this titanium alloy electrode in the electrolytic synthesis of succinic acid has the following benefits compared with the existing lead alloy and pure titanium electrodes used in industrial applications: (1) replacing the lead alloy electrode to avoid lead ion pollution of the product; (2) using the titanium alloy material to replace the pure titanium electrode can reduce the hydrogen permeation phenomenon of the material and enhance the electrode stability of the titanium electrode; (3) using the titanium alloy material to replace the pure titanium electrode can reduce the loss of the electrode and enhance the corrosion resistance of the electrode; (4) reducing the maintenance of the electrode for electrolytic synthesis of succinic acid and lowering the maintenance cost; (5) obtaining a higher current efficiency. Specific embodiments

[0018] The technical solution of the present invention will be further specifically described below through specific embodiments.

[0019] In an embodiment of the present invention, an application of a titanium alloy material in the electrolytic synthesis of succinic acid is provided. The titanium alloy material is used as a cathode electrode in the electrolytic synthesis of succinic acid; the titanium alloy material is a composition of one or more of untreated or treated Ti-6Al-4V (TC4), Ti-6Al-2Zr-2Sn-2Mo-1.5Cr-2Nb (TC21). The titanium alloy electrode material serves as the cathode in the electrolytic synthesis of succinic acid electrolysis device, replacing the current industrial cathode lead alloy electrode for electrolytic synthesis of succinic acid, avoiding lead ion pollution of the succinic acid product, and reducing the electrolytic hydrogen permeation problem of the pure titanium (TA1, TA2) cathode, improving the corrosion resistance, stability and electrolysis efficiency of the cathode in the electrolytic synthesis of succinic acid.

[0020] In an embodiment of the present invention, the treatment includes chemical treatment; more preferably, the chemical treatment includes carburizing treatment and / or nitriding treatment.

[0021] In an embodiment of the present invention, the carburizing treatment is to perform carburizing treatment on materials such as TC4 and TC21 by the double glow plasma surface alloying method; the nitriding treatment is to perform nitriding treatment on materials such as TC4 and TC21 by the plasma method.

[0022] In one embodiment of the present invention, the titanium alloy material is at least one of TC4, TC21, TC4@C, and TC4@N. Among them, TC4@C is a titanium alloy material obtained by carburizing the surface of TC4, and TC4@N is a titanium alloy material obtained by nitriding the surface of TC4. Using the titanium alloy material as the cathode electrode for the electrolytic synthesis of succinic acid can avoid lead ion pollution of the succinic acid product, further reduce the problem of electrolytic hydrogen permeation at the cathode, and further improve the corrosion resistance, stability, and electrolysis efficiency of the cathode in the electrolytic synthesis of succinic acid.

[0023] In one embodiment of the present invention, the TC4@C is a TC4@C material obtained by double glow plasma carburizing on the surface of TC4 and carburizing the surface of TC4; in one embodiment of the present invention, the TC4@N is a TC4@N material obtained by plasma nitriding on the surface of TC4 and nitriding the surface of TC4; after surface modification, TC4@C and TC4@N can further significantly reduce the hydrogen permeation characteristics of TC4 and further improve the corrosion resistance of the titanium alloy electrode material for the electrolytic synthesis of succinic acid.

[0024] In one embodiment of the present invention, the electrolytic synthesis of succinic acid process includes: using the titanium alloy material as the cathode electrode, and at least one of an iridium-titanium noble metal coated electrode, a lead alloy electrode, and a titanium substrate lead dioxide electrode as the anode electrode, using maleic anhydride as the raw material, and electrolytically synthesizing succinic acid at a constant current density in a sulfuric acid system; the more preferred electrolysis temperature is 50 - 80 °C, more preferably 60 °C, and the constant current density is 300 - 800 A / m 2 The electrolysis ends when it reaches 50 - 85% of the theoretical charge; more preferably, the constant current density is 500 A / m 2 ; more preferably, the electrolysis ends when it reaches 80% of the theoretical charge; more preferably, by adopting the above technical solution, after the electrolytic synthesis of succinic acid, the electrolyte is cooled to about 20 °C, crystallized for 4 - 10 h, and then filtered and dried to obtain succinic acid, and the current efficiency is 93.5 - 95.5%.

[0025] In one embodiment of the present invention, the electrolytic synthesis of succinic acid process includes: using the titanium alloy material as the cathode electrode and an iridium-titanium noble metal coated electrode as the anode electrode; the electrolysis temperature is 60 °C, and the constant current density is 500 A / m 2 The electrolysis ends when it reaches 80% of the theoretical charge.

[0026] In one embodiment of the present invention, when the titanium alloy material is applied to the electrolytic synthesis of succinic acid process, after electrolytically synthesizing succinic acid N (N = 1 - 25) batches, the weight is measured, and the hydrogen permeation amount is tested by an inert gas - molten heat conduction / infrared method testing method, and the electrolytic hydrogen permeation amount is 0.06 wt% - 0.15 wt%.

[0027] In one embodiment of the present invention, in the application of the titanium alloy material in the electrolytic synthesis of succinic acid, in a 10% sulfuric acid aqueous solution electrolyte, at a current density of 12000 A / m 2 The electrolysis was intensified for 24 hours, and the weight loss of the cathode electrode of the titanium alloy was not higher than 0.25%, which was lower than 50% of that of the pure titanium electrode. In this application, the titanium alloy material is used as the cathode electrode in the electrolytic synthesis of succinic acid, and it has significantly better corrosion resistance than the pure titanium electrode, further improving the stability of the cathode electrode.

[0028] In one embodiment of the present invention, in the application of the titanium alloy material in the electrolytic synthesis of succinic acid, the titanium alloy electrode is plate-shaped or net-shaped.

[0029] The following further illustrates the technical solutions of the present invention through specific embodiments. It should be noted that the following embodiments are only partial embodiments of the present invention and should not be regarded as a limitation of the technical solutions of the present invention.

[0030] Example 1

[0031] The diaphragm-free method was used to synthesize succinic acid. A net-shaped titanium substrate iridium noble metal coated electrode was used as the anode (DSA anode, with a specification of 80 mm * 100 mm), and a plate-shaped lead alloy (97 wt% Pb + 3 wt% Sb) electrode was used as the cathode (with a specification of 80 mm * 100 mm) and placed on both sides of the anode. The electrode spacing was 15 mm; the electrolyte composition was 10 wt% sulfuric acid + 10 g maleic acid (10 wt% maleic acid). The electrolyte temperature was maintained at 60 °C, and a constant current of 4 A (the current density of both the cathode and the anode was 500 A / m 2 ) The electrolysis was terminated after 1.1 hours (80% of the theoretical electricity). The electrolyte was cooled to 20 °C, crystallized for 6 hours, and filtered to obtain a saturated succinic acid mother liquor.

[0032] The lead alloy electrode was immersed in the mother liquor and left at room temperature for 15 days. Using the saturated succinic acid mother liquor after standing as the solvent, 10.0 g of maleic anhydride (10 wt% maleic acid) was added, and a constant current of 4 A (the current density of both the cathode and the anode was 500 A / m 2 ) The electrolysis was terminated after 1.1 hours (80% of the theoretical electricity). The initial cell voltage was 2.25 V. The electrolyte was cooled to 20 °C, crystallized for 6 hours, and filtered to obtain colorless succinic acid crystals. After drying, the weight was measured to be 11.05 g. Calculated based on the crude product, the current efficiency was 91.74%; the lead ion concentration in the mother liquor was measured to be 71.4 mg / kg by ultraviolet spectrophotometry, and the lead ion content in the crude succinic acid product was 8 mg / kg.

[0033] Examples 2 - 7

[0034] Using pure titanium and titanium alloys to replace lead alloy electrodes according to the method of Example 1, crude succinic acid was prepared, and the current efficiency was calculated. The results are shown in Table 1.

[0035] Table 1 Electrolytic synthesis of succinic acid using titanium and titanium alloy electrodes

[0036]

[0037]

[0038] Note: The thickness of the carbon layer and nitrogen layer in TC4@C and TC4@N is 5 - 10 μm.

[0039] The results in Table 1 show that using TA1, TA2, TC4, TC21, TC4@C, and TC4@N titanium and titanium alloy cathodes to replace lead alloy electrodes for the electrolytic synthesis of succinic acid can effectively avoid the source of lead ion pollution. The current efficiency of synthesizing succinic acid exceeds 94.0%, which is 3 - 5% higher than that of lead alloy electrodes; in the experiment, titanium and titanium alloys all showed excellent performance in the electrolytic synthesis of succinic acid.

[0040] Examples 14 - 19

[0041] TA1, TA2, TC4, TC21, TC4@C, and TC4@N titanium and titanium alloys were cut into 10 mm * 10 mm small pieces, and conductive joints were laser welded and weighed. A 50 mm * 50 mm iridium-titanium electrode was used as the anode and placed on both sides of the electrodes. The electrode spacing was 10 mm, and the electrolyte was 10% sulfuric acid aqueous solution. Electrolysis was carried out at a constant current of 0.2 A (current density 500 A / m 2 ) for 24 h; then electrolysis was carried out at a constant current of 2.4 A (current density 12000 A / m 2 ) for 24 h; the weights of each electrode after electrolysis were weighed using a high-precision electronic balance, and the weight loss of the electrodes before and after electrolysis was calculated to evaluate the corrosion resistance of the electrodes. The results are shown in Table 2 below.

[0042] Table 2 Weight loss experiment of titanium and titanium alloy electrodes under enhanced electrolysis

[0043] Example Cathode Initial weight Weight after electrolysis Weight loss Example 14 TA1 0.4608g 0.4587g 0.447％ Example 15 TA2 0.4514g 0.4492g 0.487％ Example 16 TC4 0.4618g 0.4609g 0.194％ Example 17 TC21 0.4493g 0.4483g 0.223％ Example 18 TC4@C 0.4687g 0.4679g 0.171％ Example 19 TC4@N 0.4757g 0.4748g 0.189％

[0044] The results in Table 2 show that titanium alloys with TC4, TC21, and cathodes surface-treated by carburizing TC4@C and nitriding TC4@N show better enhanced corrosion resistance than pure titanium TA1 and TA2. The weight loss of their enhanced electrodes is not higher than 0.25%, which is 50% lower than that of pure titanium electrodes. Therefore, the titanium alloy materials TC4, TC21, TC4@C, and TC4@N of this application can be used as cathodes in the electrolytic synthesis of succinic acid to greatly improve the service life of pure titanium electrodes.

[0045] Examples 20 - 31

[0046] Shear TA1, TA2, TC4, TC21, TC4@C, and TC4@N titanium and titanium alloys into sheets of 80 mm * 100 mm, ultrasonically vibrate them in acetone for 5 minutes, wash them with deionized water, and air-dry. Detect the hydrogen content of different electrode materials before electrolysis using the inert gas-fusion thermal conductivity / infrared method.

[0047] According to the method of Example 1, use TA1, TA2, TC4, TC21, TC4@C, and TC4@N electrodes to replace the lead alloy electrode for the electrolytic synthesis of succinic acid. After electrolyzing 10 batches respectively (cumulative electric quantity 11 Ah), use the inert gas-fusion thermal conductivity / infrared method to detect the hydrogen permeation amount of the electrodes after the electrolytic synthesis of succinic acid with different electrode materials.

[0048] According to the method of Example 1, use TC4, TC4@C, and TC4@N electrodes to replace the lead alloy electrode for the electrolytic synthesis of succinic acid. After electrolyzing several batches respectively, use the inert gas-fusion thermal conductivity / infrared method to detect the hydrogen permeation amount of the electrodes after the electrolytic synthesis of succinic acid with different batches and different electrode materials. The results are shown in Table 3.

[0049] Table 3 Comparison of Hydrogen Permeation Amount of Electrolytic Materials for the Electrolytic Synthesis of Succinic Acid

[0050] Example Cathode Batch / Electric quantity Initial hydrogen content Hydrogen content after electrolysis Hydrogen permeation amount Example 20 TA1 10 / 11Ah 0.0056％ 0.1380％ 0.1324％ Example 21 TA2 10 / 11Ah 0.0065％ 0.1493％ 0.1428％ Example 22 TC4 10 / 11Ah 0.0038％ 0.0817％ 0.0779％ Example 23 TC21 10 / 11Ah 0.0075％ 0.0832％ 0.0757％ Example 24 TC4@C 10 / 11Ah 0.0036％ 0.0631％ 0.0595％ Example 25 TC4@N 10 / 11Ah 0.0033％ 0.0702％ 0.0670％ Example 26 TC4 1 / 1.1Ah 0.0038％ 0.0596％ 0.0558％ Example 27 TC4 5 / 5.5Ah 0.0038％ 0.0808％ 0.077％ Example 28 TC4 15 / 16.5Ah 0.0038％ 0.0820％ 0.0782％ Example 29 TC4 25 / 27.5Ah 0.0038％ 0.0825％ 0.0787％ Example 30 TC4@C 15 / 16.5Ah 0.0036％ 0.0630％ 0.0594％ Example 31 TC4@N 15 / 16.5Ah 0.0033％ 0.0712％ 0.0679％

[0051] Table 3 experiments show that using TA1, TA2, TC4, TC21, TC4@C, and TC4@N titanium and titanium alloys as cathodes to replace the lead alloy for the electrolytic synthesis of succinic acid, among which TC4, TC21, TC4@C, and TC4@N have obvious low hydrogen permeation characteristics. TC4@C and TC4@N show more excellent low hydrogen permeation performance after carburization and hydrogen permeation treatment. During the electrolytic synthesis of succinic acid, when the electric quantity is greater than 10 Ah, the hydrogen permeation amount of the electrode tends to be stable; the low hydrogen permeation titanium alloy also shows better corrosion resistance. Among them, the TC4 alloy, as the cathode material for the electrolytic synthesis of succinic acid, has the advantages of low electrolytic hydrogen permeation amount and strong corrosion resistance, and at the same time, it has a wide source and relatively low price, and is a good electrode material to replace the lead alloy for the synthesis of succinic acid.

[0052] The above-described embodiments are only preferred solutions of the present invention, and do not impose any form of limitation on the present invention. There are other variations and modifications without exceeding the technical solutions recorded in the claims.

Claims

1. Application of a titanium alloy material in electrolytic synthesis of succinic acid, Characterized in that, The titanium alloy material is used as a cathode electrode in the electrolytic synthesis of succinic acid; the titanium alloy material is at least one of TC4, TC21, TC4@C, and TC4@N; the process of electrolytic synthesis of succinic acid uses the titanium alloy material as the cathode electrode, and at least one of an iridium-titanium noble metal coated electrode, a lead alloy electrode, and a titanium substrate lead dioxide electrode as the anode, and maleic anhydride is used as the raw material to electrolytically synthesize succinic acid at a constant current density in a sulfuric acid system.

2. The application of a titanium alloy material in electrolytic synthesis of succinic acid according to claim 1, Characterized in that, The TC4@C is TC4 subjected to surface carburization treatment by the double glow plasma surface alloying method, and the TC4@N is TC4 subjected to surface nitriding treatment by the plasma method.

3. The application of a titanium alloy material in electrolytic synthesis of succinic acid according to claim 1, Characterized in that, The titanium alloy material is used as the cathode electrode in the form of a mesh or a plate.

4. The application of a titanium alloy material in electrolytic synthesis of succinic acid according to any one of claims 1-3, Characterized in that, The electrolytic hydrogen permeation amount of the titanium alloy material after N batches of electrolytic synthesis of succinic acid is 0.06wt%-0.15wt%, where N = 1-25.

5. The application of a titanium alloy material in electrolytic synthesis of succinic acid according to any one of claims 1-3, Characterized in that, Electrolyze intensively at a current density of 12000 A / m in a 10% sulfuric acid aqueous solution electrolyte for 24 h, and the weight loss of the cathode electrode of the titanium alloy is not higher than 0.25%. 2 ​

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