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Method for preparing polyester polyol from illegal cooking oil

A technology of polyester polyol and waste oil, applied in the field of preparing polyester polyol, can solve the problem of high cost and achieve the effect of avoiding environmental pollution

Inactive Publication Date: 2012-08-15
JIANGSU KETAI NEW HEAT INSULATION MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the sources of polyester polyols are mainly petroleum cracking products such as phthalic anhydride and biochemical products such as ethylene glycol, sucrose, and sorbitol, and the cost is relatively high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The first step: 68 tons of waste oil, 1 ton of potassium hydroxide, 2 tons of water and 18 tons of sucrose, mixed and reacted at 200°C for 3 hours under the protection of nitrogen.

[0015] The second step: 89 tons of the product obtained in the first step reaction and 10 tons of phthalic anhydride were mixed and reacted at 200° C. for 8 hours under the protection of nitrogen.

[0016] Step 3: Mix and react 99 tons of the product obtained in the second step with 1 ton of sodium carbonate for 3 hours, vacuumize and dehydrate during the reaction, heat to 150°C, and the vacuum degree is less than 0.07MPa.

[0017] Finally, about 97 tons of polyester polyols are obtained, the hydroxyl value is 350-450 mPa*s, the viscosity is 1500-2500 mgKOH / g (measured with reference to the rotor viscometer method of GB / T 12008.7-2010), and the acid value is less than 2 mgKOH / g, moisture less than 0.2%.

Embodiment 2

[0019] Step 1: Mix and react 24.5 tons of waste oil, 0.2 tons of potassium hydroxide, 0.3 tons of sodium hydroxide and 8 tons of sorbitol at 160° C. for 2.5 hours under nitrogen protection.

[0020] The second step: 33 tons of the product obtained in the first step reaction and 6.8 tons of phthalic anhydride were mixed and reacted at 160° C. for 5 hours under the protection of nitrogen.

[0021] Step 3: Mix and react 39.8 tons of the product obtained in the second step with 0.2 tons of sodium carbonate for 3 hours, vacuumize and dehydrate during the reaction, heat to 140° C., and the vacuum degree is less than 0.075 MPa.

[0022] Finally, about 38 tons of polyester polyols were obtained with a hydroxyl value of 350-400 mPa*s, a viscosity of 1900-2700 mgKOH / g (measured with reference to the rotor viscometer method of GB / T 12008.7-2010), and an acid value of less than 2 mgKOH / g , moisture less than 0.2%.

Embodiment 3

[0024] The first step: 10 tons of waste oil, 0.1 tons of potassium hydroxide, 0.1 tons of sodium hydroxide, 2 tons of pentaerythritol and 2.8 tons of glycerin, mixed and reacted at 140°C for 2 hours under the protection of nitrogen.

[0025] The second step: 15 tons of the product obtained in the first step and 3.5 tons of phthalic anhydride were mixed and reacted at 140° C. for 6 hours under the protection of nitrogen.

[0026] The third step: react 18.5 tons of the product obtained in the second step with 0.1 ton of sodium carbonate for 3 hours, vacuumize and dehydrate during the reaction, heat to 130°C, and the vacuum degree is less than 0.070MPa.

[0027] Finally, about 17 tons of polyester polyols are obtained, the hydroxyl value is 300-350 mPa*s, the viscosity is 1400-2200 mgKOH / g (measured with reference to the rotor viscometer method of GB / T 12008.7-2010), and the acid value is less than 2 mgKOH / g, moisture less than 0.2%.

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Abstract

The invention discloses a method for preparing polyester polyol from illegal cooking oil, which comprises the following steps: 1) mixing illegal cooking oil, a catalyst and an initiator to react for 1-5 hours, wherein in the reaction process, protective nitrogen gas or inert gas is introduced, and the temperature is raised to 100-300 DEG C; 2) mixing the product obtained in the step 1) and phthalic anhydride to react for 5-10 hours, wherein in the reaction process, protective nitrogen gas or inert gas is introduced, and the temperature is raised to 100-300 DEG C; and 3) mixing the reaction product of the step 2) and sodium carbonate to react for 1-3 hours, wherein in the reaction process, vacuumization and dehydration are carried out, the temperature is raised to 100-150 DEG C, and the vacuum degree is less than 0.08MPa. The illegal cooking oil is utilized to produce the polyester polyol, thereby changing wastes into valuable substances and providing a way out for the illegal cooking oil; and thus, the invention prevents the illegal cooking oil from entering the edible oil market and jeopardizing the human health, and also prevents the illegal cooking oil from flowing into the sewers to pollute the environment.

Description

technical field [0001] The invention relates to a method for preparing polyester polyols from waste oil. Background technique [0002] Waste oil generally refers to all kinds of low-quality oils that exist in daily life, such as recycled cooking oil, repeatedly used frying oil, etc. Long-term consumption may cause cancer and is extremely harmful to the human body. A large amount of waste oil not only pollutes the environment, but also because there is no small economic temptation, some people take the risk of selling waste oil and seriously endanger people's health. Therefore, it is an urgent problem to find a reasonable waste oil recycling method. Reasonable use can not only reduce environmental pollution, but also save energy [0003] The rational utilization technologies of waste oil currently developed mainly include: 1) Biodiesel production from waste oil: biodiesel was successfully extracted from waste animal and vegetable oils by using self-developed technology and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/127C08G63/78
Inventor 曹晖
Owner JIANGSU KETAI NEW HEAT INSULATION MATERIAL