Method for recycling waste glycerol

Abstract

The present application relates to waste glycerol utilization technical field, specifically to a kind of waste glycerol recycling method, including step one: proportioning waste glycerol and emulsifier, stirring in heating process, obtain the uniformly dispersed waste glycerol emulsion;Step two: water, preservative, filler are sequentially added to the waste glycerol emulsion obtained in step one, and the mixed liquid uniformly mixed is obtained by heat preservation stirring;Step three: the temperature of the mixed liquid obtained in step two is reduced to room temperature, and the retarder is obtained.The waste glycerol recycling method provided by the present application uses waste glycerol to prepare retarder, realizes the recycling of waste glycerol, avoids the high cost of existing waste glycerol incineration treatment and the environmental pollution problem caused.

Description

A method for recycling waste glycerin Technical Field

[0001] This invention relates to the field of waste glycerin utilization technology, and specifically to a method for reusing waste glycerin. Background Technology

[0002] Glycerin, chemically known as glycerol, is a colorless, odorless, sweet-tasting viscous liquid. With three hydroxyl groups, it can participate in various chemical reactions and is an important organic chemical raw material widely used in the food and tobacco industries, pharmaceutical and cosmetic manufacturing, polymer material processing, and transportation. For a long time, my country's demand for glycerin has exceeded its supply, often necessitating large-scale imports of high-purity glycerin. However, the high price of high-purity glycerin increases industrial production costs, thus hindering industrial production to some extent. Since the price difference between high-purity glycerin and crude glycerin (a byproduct of biodiesel production) is more than tenfold, and the production volume of crude glycerin is substantial (approximately one ton of crude glycerin is generated for every 10 tons of biodiesel produced), refining crude glycerin to obtain high-purity glycerin can, to some extent, address the problem of demand exceeding supply for high-purity glycerin.

[0003] Crude glycerin's main component is glycerol, and it also contains a certain amount of oils, salts, and methanol. After refining, crude glycerin produces a certain amount of waste glycerin, which contains glycerol, inorganic salts, and some oils. Because waste glycerin contains flammable substances such as glycerol and oils, it is classified as hazardous waste and is currently mainly disposed of by incineration. However, incineration is costly and does not facilitate the recycling and reuse of waste glycerin. Summary of the Invention

[0004] To address the technical problems of high cost and poor resource utilization caused by the incineration of waste glycerin in the existing technology, the present invention provides a method for the reuse of waste glycerin. By using waste glycerin to prepare a retarder, the recycling and reuse of waste glycerin is realized, avoiding the high cost and environmental pollution problems caused by the existing waste glycerin incineration treatment.

[0005] The technical solution of this invention is as follows:

[0006] A method for reusing waste glycerin includes the following steps:

[0007] Step 1: Weigh the waste glycerin and emulsifier according to the ratio, stir during heating to obtain a uniformly dispersed waste glycerin emulsion;

[0008] Step 2: Add water, preservative, and filler to the waste glycerin emulsion obtained in Step 1 in sequence, keep warm and stir to obtain a uniformly mixed solution;

[0009] Step 3: After cooling the mixture obtained in Step 2 to room temperature, a retarder is obtained.

[0010] Furthermore, the waste glycerin is 50-60 parts by weight, the emulsifier is 12-14 parts by weight, the preservative is 0.5-1 parts by weight, the filler is 20-30 parts by weight, and the water is 10-60 parts by weight.

[0011] Furthermore, waste glycerol includes glycerol, fatty acids, and salts. The waste glycerol used in this invention is the residue produced during the refining process of crude glycerol. Glycerol is characterized by its small dosage and strong retarding effect, and it maintains a stable retarding effect even with temperature changes. Glycerol also has moisturizing and antifreeze properties, enabling it to retard in dry, low-temperature environments. The -COOH groups in the fatty acids can react with the CaO in concrete. 2+ The formation of unstable complexes controls the Ca content in the liquid phase during the initial stages of hydration. 2+ Concentration is beneficial for slow condensation.

[0012] Furthermore, salts include both organic and inorganic salts. Organic salts include, but are not limited to, sodium fatty acids, while inorganic salts include, but are not limited to, sodium chloride and sodium sulfate. Sodium fatty acids can improve the plasticity and flowability of concrete. Sodium chloride ionizes in water to produce Cl-. - with Na + Cl - Ca in the liquid phase can be consumed 2+ Sodium chloride reacts with water to form CaCl2, which enhances the strength of concrete. Simultaneously, sodium chloride lowers the freezing point of water, providing antifreeze properties and improving the low-temperature fluidity of concrete. Sodium sulfate ionizes in water to produce SO42-. 2- with Na + Na + Ca in the liquid phase of the hydration stage can be replaced 2+ This helps reduce the Ca content in the liquid phase. 2+ concentration.

[0013] Furthermore, the emulsifier is an anionic emulsifier.

[0014] Furthermore, anionic emulsifiers include sodium stearate, sodium dodecyl sulfate, and sodium citrate.

[0015] Furthermore, the preservatives are propionate and / or dehydroacetate, and the fillers are silica or mica.

[0016] Furthermore, in step one, the heating temperature is 65-75℃.

[0017] Furthermore, in step three, the temperature of the mixture is lowered to room temperature while being stirred.

[0018] The beneficial effects of this invention are as follows:

[0019] This invention provides a method for reusing waste glycerin, employing a step-by-step addition of formulation components. First, waste glycerin and an emulsifier are weighed and stirred during heating. Then, water, a preservative, and a filler are added, which facilitates thorough mixing of the preservative, filler, and waste glycerin, resulting in a retarder. This invention fully utilizes the synergistic effect of glycerin and sodium chloride in waste glycerin to delay concrete hydration while improving the concrete's resistance to freezing and drying, thus expanding the application range of concrete. Furthermore, the fatty acids and sodium sulfate in waste glycerin reduce the calcium content in the liquid phase during the concrete hydration stage. 2+ The concentration of glycerol is adjusted, and sodium fatty acid is used to improve the plasticity and fluidity of concrete. This invention adds an emulsifier to the retarder, allowing waste glycerol to disperse more evenly in water. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0021] Example 1

[0022] A method for reusing waste glycerin includes the following steps:

[0023] Step 1: Weigh 52 parts by weight of waste glycerin and 12 parts by weight of emulsifier. Mix the waste glycerin and emulsifier together and heat to 70°C with slow stirring to obtain a uniformly dispersed waste glycerin emulsion. The waste glycerin is the residue produced during the refining process of crude glycerin and includes glycerin, fatty acids, sodium fatty acids, sodium chloride, and sodium sulfate. The emulsifier includes sodium stearate, sodium dodecyl sulfate, and sodium citrate, wherein the mass ratio of sodium stearate, sodium dodecyl sulfate, and sodium citrate is 3:2:1.

[0024] Step 2: Add 30 parts by weight of water, 0.6 parts by weight of propionate, and 20 parts by weight of silica to the waste glycerin emulsion obtained in Step 1 in sequence, and keep it at 70°C while stirring to obtain a uniformly mixed solution;

[0025] Step 3: After stirring and cooling the mixture obtained in Step 2 to 25°C, a retarder is obtained.

[0026] Example 2

[0027] A method for reusing waste glycerin includes the following steps:

[0028] Step 1: Weigh 60 parts by weight of waste glycerin and 14 parts by weight of emulsifier. Mix the waste glycerin and emulsifier together and heat to 65°C with slow stirring to obtain a uniformly dispersed waste glycerin emulsion. The waste glycerin is the residue produced during the refining process of crude glycerin and includes glycerin, fatty acids, sodium fatty acids, sodium chloride, and sodium sulfate. The emulsifier includes sodium stearate, sodium lauryl sulfate, and sodium citrate, wherein the mass ratio of sodium stearate, sodium lauryl sulfate, and sodium citrate is 3:1:1.5.

[0029] Step 2: Add 56 parts by weight of water, 1 part by weight of dehydroacetate, and 28 parts by weight of silica to the waste glycerin emulsion obtained in Step 1 in sequence, and keep it at 65°C while stirring to obtain a uniformly mixed solution.

[0030] Step 3: After stirring and cooling the mixture obtained in Step 2 to 25°C, a retarder is obtained.

[0031] Example 3

[0032] A method for reusing waste glycerin includes the following steps:

[0033] Step 1: Weigh 55 parts by weight of waste glycerin and 12 parts by weight of emulsifier. Mix the waste glycerin and emulsifier together and heat to 75°C with slow stirring to obtain a uniformly dispersed waste glycerin emulsion. The waste glycerin is the residue produced during the refining process of crude glycerin and includes glycerin, fatty acids, sodium fatty acids, sodium chloride, and sodium sulfate. The emulsifier includes sodium stearate, sodium dodecyl sulfate, and sodium citrate, wherein the mass ratio of sodium stearate, sodium dodecyl sulfate, and sodium citrate is 2:3:1.

[0034] Step 2: Add 40 parts by weight of water, 0.7 parts by weight of propionate, and 25 parts by weight of mica to the waste glycerin emulsion obtained in Step 1 in sequence, and keep it at 75°C while stirring to obtain a uniformly mixed solution.

[0035] Step 3: After stirring and cooling the mixture obtained in Step 2 to 25°C, a retarder is obtained.

[0036] The retarder obtained in Examples 1-3 was tested for its retarding effect using existing technology. The test results are shown in Table 1.

[0037] Table 1. Test results of the retarding effect of the retarder obtained in Examples 1-3

[0038]

[0039] As shown in Table 1, the retarders obtained in Examples 1-3 have the effect of retarding and strengthening concrete compared with the blank control test. Moreover, the retarding effect is improved to a certain extent as the dosage of the retarder increases.

[0040] Although the present invention has been described in detail by way of preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the present invention by those skilled in the art without departing from the spirit and essence of the invention, and such modifications or substitutions should all be within the scope of the present invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should also be covered within the protection scope of the present invention.

Claims

1. A method for reusing waste glycerin, characterized in that, The process includes the following steps: Step 1: Weigh waste glycerin and emulsifier according to the specified proportions, and stir during heating to obtain a uniformly dispersed waste glycerin emulsion; Step 2: Add water, preservative, and filler sequentially to the waste glycerin emulsion obtained in Step 1, and stir while maintaining the temperature to obtain a uniformly mixed solution; Step 3: After cooling the temperature of the mixture obtained in Step 2 to room temperature, a retarder is obtained; The waste glycerin comprises 50-60 parts by weight, the emulsifier comprises 12-14 parts by weight, the preservative comprises 0.5-1 parts by weight, the filler comprises 20-30 parts by weight, and the water comprises 10-60 parts by weight; The emulsifier is an anionic emulsifier; The preservative is propionate and / or dehydroacetate, and the filler is silica or mica.

2. The reuse method as described in claim 1, characterized in that, Waste glycerol includes glycerol, fatty acids, and salts.

3. The reuse method as described in claim 2, characterized in that, Salts include organic salts and inorganic salts.

4. The reuse method as described in claim 1, characterized in that, Anionic emulsifiers include sodium stearate, sodium dodecyl sulfate, and sodium citrate.

5. The reuse method as described in claim 1, characterized in that, In step one, the heating temperature is 65-75℃.

6. The reuse method as described in claim 1, characterized in that, In step three, the temperature of the mixture is lowered to room temperature while stirring.

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