A cooking aid and its preparation method and application

Abstract

The present invention provides a cooking aid, a preparation method, and an application thereof, which belong to the field of papermaking and pulping. The cooking aid is prepared from the following raw materials in parts by weight: 50 to 75 parts of a dispersant, 35 to 90 parts of a penetrant, 10 to 30 parts of a degreasing agent, and 100 to 120 parts of water; the dispersant is prepared from water, acrylic acid, maleic anhydride, 2-acrylamido-2-methylpropanesulfonic acid, and an initiator; or the dispersant is prepared from water, allyl polyoxyethylene ether, sodium α-olefin sulfonate, 2-acrylamido-2-methylpropanesulfonic acid, and an initiator. The cooking aid prepared by the present invention can meet the production requirements of manufacturers, exceeding the manufacturer's requirements in terms of alkali consumption, KP value, pulp board whiteness, chlorine dioxide dosage, hydrogen peroxide dosage, and resin control agent dosage.

Description

Technical Field

[0001] The present invention relates to the field of papermaking and pulping, in particular to a cooking aid and a preparation method and application thereof. Background Art

[0002] In the chemical pulping process, cooking aids significantly impact the rate of lignin removal, pulp quality, pulp yield, and subsequent bleaching. Currently, many pulping companies use cooking aids such as alkaline sulfide, anthraquinone, and its derivatives. These cooking aids have poor solubility and slow penetration into the raw material. Lignin decomposition and dissolution take a long time, making removed impurities susceptible to reabsorption by the fibers, impacting pulp quality and yield. Furthermore, these agents are toxic, pose a significant environmental risk, are prone to scaling in pipes, and are highly corrosive to equipment. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides a cooking aid and a preparation method and application thereof, which make up for the deficiencies of the prior art.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] The present invention provides a cooking aid, which is prepared from the following raw materials in parts by weight:

[0006] 50-75 parts of dispersant, 35-90 parts of penetrant, 10-30 parts of degreasing agent and 100-120 parts of water;

[0007] The dispersant is prepared from water, acrylic acid, maleic anhydride, 2-acrylamido-2-methylpropanesulfonic acid and an initiator;

[0008] Or the dispersant is prepared from water, allyl polyoxyethylene ether, sodium α-olefin sulfonate, 2-acrylamido-2-methylpropanesulfonic acid and an initiator.

[0009] Preferably, the mass ratio of the water, acrylic acid, maleic anhydride, 2-acrylamido-2-methylpropanesulfonic acid and initiator is 80-155:15-25:10-20:5-8:1-1.5.

[0010] Preferably, the mass ratio of the water, allyl polyoxyethylene ether, sodium α-olefin sulfonate, 2-acrylamido-2-methylpropanesulfonic acid and initiator is 170-190:10-15:25-30:15-20:1-2.

[0011] Preferably, the initiator includes one or more of hydrogen peroxide, sodium persulfate, ammonium persulfate and tert-butyl peroxide.

[0012] Preferably, the preparation method of the dispersant comprises: mixing the water, acrylic acid, maleic anhydride, 2-acrylamido-2-methylpropanesulfonic acid and initiator at 80-90° C. for 2-3 hours to obtain a mixture;

[0013] The mixture is reacted at 80-90° C. for 1-1.5 hours to obtain a reactant.

[0014] The temperature of the reactant is lowered to 45° C., and the pH value of the reactant is adjusted to 6.0-6.5 to obtain a dispersant.

[0015] Preferably, the preparation method of the dispersant comprises: mixing water, allyl polyoxyethylene ether, sodium α-olefin sulfonate, 2-acrylamido-2-methylpropanesulfonic acid and an initiator at 80-90° C. for 2.5-3 hours to obtain a mixture;

[0016] The mixture is reacted at 80-90° C. for 1-1.5 hours to obtain a reactant.

[0017] The temperature of the reactant is lowered to 45° C., and the pH value of the reactant is adjusted to 6.0-7.0 to obtain a dispersant.

[0018] Preferably, the penetrant includes one or more of isomeric decanol polyoxyethylene ether sodium succinate sulfonate, secondary alkyl sodium sulfonate, isomeric decanol polyoxyethylene ether and isomeric decanol polyoxyethylene ether phosphate.

[0019] Preferably, the degreasing agent includes one or more of alkyl glycoside, sodium fatty alcohol polyoxyethylene ether carboxylate, plant polyphenol polyoxyethylene ether, fatty acid methyl ester ethoxylate FMEE, lauryl betaine and cocamidopropyl betaine.

[0020] The present invention also provides a method for preparing the cooking aid described in the above technical solution, comprising the following steps: stirring the dispersant, penetrant, degreasing agent and water at 45-55° C. for 30 minutes to obtain the cooking aid.

[0021] The present invention also provides the use of the cooking aid described in the above technical solution in cooking bamboo chips.

[0022] The beneficial effects of the present invention are:

[0023] The cooking aid prepared by the present invention can meet the production requirements of manufacturers, and exceeds the requirements of manufacturers in terms of alkali consumption, KP value, pulp board whiteness, chlorine dioxide dosage, hydrogen peroxide dosage and resin control agent dosage. DETAILED DESCRIPTION

[0024] The present invention provides a cooking aid, which is prepared from the following raw materials in parts by weight: 50-75 parts of a dispersant, 35-90 parts of a penetrant, 10-30 parts of a degreasing agent and 100-120 parts of water; the dispersant is prepared from water, acrylic acid, maleic anhydride, 2-acrylamido-2-methylpropanesulfonic acid and an initiator; or the dispersant is prepared from water, allyl polyoxyethylene ether, sodium α-olefin sulfonate, 2-acrylamido-2-methylpropanesulfonic acid and an initiator.

[0025] In the present invention, the mass ratio of water, acrylic acid, maleic anhydride, 2-acrylamido-2-methylpropanesulfonic acid, and initiator is preferably 80-155:15-25:10-20:5-8:1-1.5. In the present invention, the initiator preferably includes one or more of hydrogen peroxide, sodium persulfate, ammonium persulfate, and tert-butyl peroxide. In the present invention, the preparation method of the dispersant preferably comprises: mixing the water, acrylic acid, maleic anhydride, 2-acrylamido-2-methylpropanesulfonic acid, and initiator at 80-90°C for 2-3 hours to obtain a mixture; reacting the mixture at 80-90°C for 1-1.5 hours to obtain a reactant; lowering the temperature of the reactant to 45°C and adjusting the pH of the reactant to 6.0-6.5 to obtain the dispersant. In the present invention, the dispersant effectively chelates calcium and magnesium ions, improves the uniformity of the cooking process, effectively disperses stickies produced during the cooking process, and reduces the amount of resin control agent used. Furthermore, this cooking aid utilizes optimized surfactants consisting of sodium secondary alkyl sulfonate and isomeric alcohol ethers to enhance the penetration and exchange of cooking liquid within the wood body, achieving rapid penetration, improving pulping yield, reducing alkali usage, and shortening cooking time. According to the immersion method for determining the wetting power of surfactants specified in GBT 11983-2008, the cooking aid, penetrant JFC, and rapid penetrant T exhibited permeabilities of less than 5s, 11s, and 7s, respectively. The use of an amphoteric surfactant as a degreasing agent enhances product stability and effectiveness in alkaline, high-temperature, and high-pressure environments. This cooking aid eliminates the addition of anthraquinone, reducing toxic and harmful components in the production process and benefiting worker health.

[0026] In the present invention, the mass ratio of water, allyl polyoxyethylene ether, sodium α-olefin sulfonate, 2-acrylamido-2-methylpropanesulfonic acid, and initiator is preferably 170-190:10-15:25-30:15-20:1-2. In the present invention, the initiator preferably includes one or more of hydrogen peroxide, sodium persulfate, ammonium persulfate, and tert-butyl peroxide. In the present invention, the preparation method of the dispersant preferably includes: mixing water, allyl polyoxyethylene ether, sodium α-olefin sulfonate, 2-acrylamido-2-methylpropanesulfonic acid, and initiator at 80-90° C. for 2.5-3 hours to obtain a mixture; reacting the mixture at 80-90° C. for 1-1.5 hours to obtain a reactant; reducing the temperature of the reactant to 45° C. and adjusting the pH value of the reactant to 6.0-7.0 to obtain a dispersant. In the present invention, the dispersant effectively chelates calcium, magnesium and other metal ions, thereby improving the dispersibility of the cooking aid on stickies produced during the cooking process and reducing the amount of resin control agent used. In addition, the cooking aid optimizes the use of isomeric alcohol ether surfactants as components, which can achieve rapid penetration, improve pulping yield, reduce alkali usage, shorten cooking time, etc. The addition of a degreasing agent can effectively improve the emulsification and dispersion of resin oil during the cooking process and quickly remove it. Surfactants such as alkyl glycosides, plant polyphenol polyoxyethylene ethers, and sodium fatty alcohol polyoxyethylene ether carboxylates are emulsifiers with outstanding biodegradability, which is beneficial to environmental protection. This cooking aid does not add anthraquinone, reduces toxic and harmful components in the production process, and is beneficial to the health of workers.

[0027] In the present invention, the reagent used to adjust the pH value of the reactants preferably includes monoethanolamine, ammonia water, sodium hydroxide or 2-amino-2-methyl-1-propanol.

[0028] In the present invention, the penetrant preferably includes one or more of isomeric decanol polyoxyethylene ether sodium succinate sulfonate, secondary alkyl sodium sulfonate, isomeric decanol polyoxyethylene ether and isomeric decanol polyoxyethylene ether phosphate.

[0029] In the present invention, the degreasing agent includes one or more of alkyl glycoside, sodium fatty alcohol polyoxyethylene ether carboxylate, plant polyphenol polyoxyethylene ether, fatty acid methyl ester ethoxylate FMEE, lauryl betaine and cocamidopropyl betaine.

[0030] The present invention also provides a method for preparing the cooking aid described in the above technical solution, comprising the following steps: stirring the dispersant, penetrant, degreasing agent and water at 45-55° C. for 30 minutes to obtain the cooking aid.

[0031] The present invention also provides the use of the cooking aid described in the above technical solution in cooking bamboo chips.

[0032] In order to further illustrate the present invention, the present invention is described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0033] Example 1

[0034] (1) 120 parts of deionized water (as bottom water, reaction medium) are added to a reactor, 10 parts of allyl polyoxyethylene ether, 30 parts of sodium α-olefin sulfonate, 20 parts of 2-acrylamido-2-methylpropanesulfonic acid, and 50 parts of deionized water are mixed and stirred to dissolve as a mixed monomer and added to header tank 1 for standby use, 2 parts of sodium persulfate and 20 parts of deionized water are mixed and stirred to dissolve and added to header tank 2 for standby use, the temperature is raised to 80-90° C., stirring is started, and the mixed monomer and sodium persulfate solution are added dropwise. The addition is completed over about 2.5 hours, and the mixture is reacted at 80-90° C. for 1.5 hours after the addition is completed. The temperature is then lowered to 45° C., and the pH value is adjusted to 7.0 with monoethanolamine as a regulator to obtain a dispersant;

[0035] (2) Take 75 parts of the above dispersant and add it to the reactor, then add 35 parts of isomeric decanol polyoxyethylene ether succinate sodium sulfonate, 3 parts of alkyl glycoside, 27 parts of fatty alcohol polyoxyethylene ether sodium carboxylate, and 150 parts of deionized water, raise the temperature to 45°C, and stir for 30 minutes to obtain a cooking aid.

[0036] Example 2

[0037] (1) 120 parts of deionized water (as bottom water, reaction medium) are added to a reactor, 15 parts of allyl polyoxyethylene ether, 25 parts of sodium α-olefin sulfonate, 15 parts of 2-acrylamido-2-methylpropanesulfonic acid, and 40 parts of deionized water are mixed and stirred to dissolve as a mixed monomer and added to a header tank 1 for standby use, 2 parts of hydrogen peroxide and 10 parts of deionized water are mixed and stirred to dissolve and added to a header tank 2 for standby use, the temperature is raised to 80-90° C., stirring is started, and the mixed monomer and hydrogen peroxide solution are added dropwise. The addition is completed over about 3 hours, and the mixture is reacted at 80-90° C. for 1 hour after the addition is completed. The temperature is then lowered to 45° C., and the pH value is adjusted to 6.0 with an ammonia water regulator to obtain a dispersant;

[0038] (2) Take 50 parts of the above dispersant and add it to the reactor, then add 35 parts of isomeric decanol polyoxyethylene ether sodium succinate sulfonate, 20 parts of isomeric decanol polyoxyethylene ether, 30 parts of plant polyphenol polyoxyethylene ether, and 120 parts of deionized water, raise the temperature to 45°C, and stir for 30 minutes to obtain a cooking aid.

[0039] The cooking aid prepared in Examples 1-2 of the present invention was used in a kraft pulping process at a pulp mill to perform a performance test on bamboo chips. The scheme is as follows:

[0040] Table 1 Scheme

[0041]

[0042] Refer to GB / T 1546-2004 Determination of Kappa Number of Pulp, the results are shown in Table 2:

[0043] Table 2 Comparison of the performance of the cooking aids prepared in the examples of the present invention

[0044]

[0045] It can be concluded from Table 2 that the cooking aid prepared by the present invention can meet the production requirements of manufacturers, and exceeds the requirements of manufacturers in terms of alkali consumption, KP value, pulp board whiteness, chlorine dioxide dosage, hydrogen peroxide dosage and resin control agent dosage.

[0046] Example 3

[0047] (1) Add 50 parts of deionized water to a reactor, stir and dissolve 15 parts of acrylic acid, 10 parts of maleic anhydride, 5 parts of 2-acrylamido-2-methylpropanesulfonic acid, and 20 parts of deionized water as a mixed monomer, and add them to header tank 1 for later use; stir and dissolve 1 part of ammonium persulfate and 10 parts of deionized water, and add them to header tank 2 for later use; heat to 80-90° C., start stirring, and dropwise add the mixed monomer and ammonium persulfate solution; complete the addition over about 3 hours; react at 80-90° C. for 1.5 hours after the addition is complete, cool to 45° C., and adjust the pH to 6.5 with sodium hydroxide to obtain a dispersant;

[0048] (2) Take 50 parts of the above dispersant and add it to the reactor, then add 15 parts of secondary alkyl sulfonate sodium, 35 parts of isomeric decanol polyoxyethylene ether, 15 parts of cocamidopropyl betaine, and 100 parts of deionized water, raise the temperature to 45°C, and stir for 30 minutes to obtain a cooking aid.

[0049] Example 4

[0050] (1) 100 parts of deionized water are added to a reactor, 25 parts of acrylic acid, 20 parts of maleic anhydride, 8 parts of 2-acrylamido-2-methylpropanesulfonic acid, and 40 parts of deionized water are mixed and stirred to dissolve as a mixed monomer, and then added to a header tank 1 for standby use; 1.5 parts of tert-butyl peroxide and 15 parts of deionized water are mixed and stirred to dissolve and then added to a header tank 2 for standby use; the temperature is raised to 80-90° C., stirring is started, and the mixed monomer and tert-butyl peroxide solution are added dropwise. The addition is completed over about 2 hours, and the mixture is reacted at 80-90° C. for 1 hour after the addition is completed. The temperature is then lowered to 45° C., and the pH value is adjusted to 6.0 with 2-amino-2-methyl-1-propanol to obtain a dispersant;

[0051] (2) 70 parts of the above dispersant were added to a reactor, followed by 25 parts of isomeric decanol polyoxyethylene ether phosphate, 65 parts of isomeric decanol polyoxyethylene ether sodium succinate sulfonate, 5 parts of fatty acid methyl ester ethoxylate FMEE, 5 parts of lauryl betaine, and 200 parts of deionized water. The mixture was heated to 55° C. and stirred for 30 minutes to obtain a cooking aid.

[0052] The cooking aids prepared in Examples 3-4 of the present invention were used in a kraft pulping process (same as Example 2) to steam bamboo chips for performance testing. The results are shown in Table 3:

[0053] Table 3 Comparison of the performance of the cooking aids prepared in the embodiments of the present invention

[0054]

[0055] Utilize calcium carbonate acid-base titration to measure the dispersibility of described dispersant: get 1g dispersant sample (embodiment 1), constant volume in 100mL volumetric flask, configuration does not put the blank solution of sample simultaneously, and changes this solution in the 100mL colorimetric tube.Take by weighing the calcium carbonate powder 2.00g of oven dry and pour in the colorimetric tube, violently shake up and down 100 times, left standstill 30 minutes in room temperature.Accurately pipette 20mL solution in Erlenmeyer flask at the colorimetric tube 50mL place, add 65mL water dilution, add the hydrochloric acid standard solution of 15mL 1.0mol / L and 6-7 bromocresol green-methyl red indicator then.It is terminal point that sodium hydroxide standard solution with 0.5mol / L is titrated to wine red, and the amount of used sodium hydroxide standard solution is V1 , the dispersibility of dispersant is calculated as follows:

[0056] Dispersibility = c × (V0 - V1) × 100.09 / 2. c - concentration of sodium hydroxide standard solution; V0 - volume of standard solution consumed for titration of blank / mL; V1 - volume of standard solution consumed for titration of sample / mL. The greater the calculated number of milligrams of calcium carbonate, the better the dispersibility. Compared with commercially available sodium polyacrylate dispersants, the calculated number of milligrams of calcium carbonate for the dispersant is around 170-180 mg, while that for commercially available sodium polyacrylate dispersants is around 120-150 mg. When 1% of the water weight of the dispersant and the commercially available sodium polyacrylate dispersant are added to tap water with a hardness of 400 mg / kg, respectively, and tested using hardness test paper, the hardness of the dispersant can be reduced to below 150 mg / kg, while that of the commercially available sodium polyacrylate is reduced to around 200 mg / kg, indicating that the dispersibility and chelating power of the dispersant are better than those of the commercially available sodium polyacrylate dispersants.

[0057] Although the above embodiment provides a detailed description of the present invention, it is only a part of the embodiments of the present invention, not all of the embodiments. People can also obtain other embodiments based on this embodiment without creativity, and these embodiments all fall within the scope of protection of the present invention.

Claims

1. Application of cooking aids in cooking bamboo chips; The cooking aid is prepared from the following raw materials in parts by weight: 50-75 parts of dispersant, 35-90 parts of penetrant, 10-30 parts of degreasing agent and 100-120 parts of water; The dispersant is prepared from water, acrylic acid, maleic anhydride, 2-acrylamido-2-methylpropanesulfonic acid and an initiator; Or the dispersant is prepared from water, allyl polyoxyethylene ether, sodium α-olefin sulfonate, 2-acrylamido-2-methylpropanesulfonic acid and an initiator; The mass ratio of water, acrylic acid, maleic anhydride, 2-acrylamido-2-methylpropanesulfonic acid and initiator is 80-155:15-25:10-20:5-8:1-1.5; The mass ratio of the water, allyl polyoxyethylene ether, sodium α-olefin sulfonate, 2-acrylamido-2-methylpropanesulfonic acid and initiator is 170-190:10-15:25-30:15-20:1-2; The initiator includes one or more of hydrogen peroxide, sodium persulfate, ammonium persulfate and tert-butyl peroxide; The preparation method of the dispersant comprises: Mixing the water, acrylic acid, maleic anhydride, 2-acrylamido-2-methylpropanesulfonic acid and initiator at 80-90° C. for 2-3 hours to obtain a mixture; The mixture is reacted at 80-90° C. for 1-1.5 hours to obtain a reactant. Lowering the temperature of the reactants to 45° C. and adjusting the pH value of the reactants to 6.0 to 6.5 to obtain a dispersant; The preparation method of the dispersant comprises: mixing water, allyl polyoxyethylene ether, sodium α-olefin sulfonate, 2-acrylamido-2-methylpropanesulfonic acid and an initiator at 80-90° C. for 2.5-3 hours to obtain a mixture; The mixture is reacted at 80-90° C. for 1-1.5 hours to obtain a reactant. Lowering the temperature of the reactant to 45° C. and adjusting the pH value of the reactant to 6.0 to 7.0 to obtain a dispersant; The penetrant includes one or more of isomeric decanol polyoxyethylene ether sodium succinate sulfonate, secondary alkyl sodium sulfonate, isomeric decanol polyoxyethylene ether and isomeric decanol polyoxyethylene ether phosphate; The degreasing agent comprises one or more of alkyl glycoside, sodium fatty alcohol polyoxyethylene ether carboxylate, plant polyphenol polyoxyethylene ether, fatty acid methyl ester ethoxylate FMEE, lauryl betaine and cocamidopropyl betaine.

2. The use according to claim 1, characterized in that The preparation method of the cooking aid comprises the following steps: stirring the dispersant, penetrant, degreasing agent and water at 45-55° C. for 30 minutes to obtain the cooking aid.

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