Modified adsorbent, refined grease and preparation method thereof

A technology for refining oil and adsorbent, applied in the field of refined oil and its preparation, modified adsorbent, and can solve problems such as poor effect

Pending Publication Date: 2020-10-27

HUBEI GEDIAN HUMANWELL PHARMA EXCIPENTS

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AI-Extracted Technical Summary

Problems solved by technology

[0005] The present invention aims to overcome the defects in the prior art that deacidification, decolorization and reduction of peroxide val...

Abstract

The invention discloses a modified adsorbent, refined grease and a preparation method thereof. The preparation method of the modified adsorbent comprises the following steps: mixing a suspension of layered double hydroxides with a solution of reducing salt for the first time, and then mixing with a decolorizing adsorbent for the second time, wherein the mass molar ratio of the layered double hydroxide to the reducing salt is 100: 1-300: 1, the mass ratio of the layered double hydroxide to the decolorizing adsorbent is 3: 1-5: 1, and the reducing salt comprises sulfite and/or nitrite. The modified adsorbent can reduce the acid value, chroma, peroxide value and other parameters in the grease at the same time, and the purity of the obtained grease is better.

Application Domain

Other chemical processesFatty-oils/fats refining +1

Technology Topic

Nitrite saltSulfite salt +4

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Examples

Experimental program(14)
Comparison scheme(7)
Effect test(1)

Example Embodiment

[0071] Example 1

[0072] (1) Preparation of layered double metal hydroxides

[0073] In a 2L beaker, add 1.0mol magnesium hydroxide and 1.0mol aluminum hydroxide respectively, then add 500mL water, stir to mix the magnesium hydroxide and aluminum hydroxide evenly, and prepare a suspension; add 1.0mol sodium bicarbonate and 200mL of water was added to a 500mL beaker, and after stirring to dissolve it completely, a sodium bicarbonate solution was obtained; then the sodium bicarbonate solution was added to the above suspension, stirred for 30min to make it evenly mixed, and a mixed solution was obtained;

[0074] The above mixed solution was slowly heated to 80-90°C, the heating rate was controlled at 0.5-1.0°C/min, and the reaction was performed at 80-90°C for 3 hours, then cooled to room temperature, kept stirring for 3 hours, and then slowly heated to 60-70°C ℃, the heating rate is controlled at 1.0 ~ 2.0 ℃/min. That is, the layered double metal hydroxide is obtained. After drying, the mass of the layered double metal hydroxide is 165 g. A suspension with a mass concentration of 23.5% is prepared, and the following operation is continued at 60-70° C.

[0075] (2) Addition of reducing salt and decolorizing adsorbent

[0076] Dissolve 0.6 mol of sodium nitrite in 200 mL of water to obtain a sodium sulfite solution; then drop the sodium sulfite solution into the suspension of the layered double metal hydroxide within 30 min, and keep stirring for 2 h to obtain a modified layer Then, in the modified layered double metal hydroxide solution, under the condition of keeping warm, add 40g activated carbon and stir for 2h, then cool to room temperature, filter, wash the filter cake with water several times, filter When the filtrate was clear and transparent, the filter cake was placed in a tray and dried in an oven at 60°C to constant weight, and the material was collected to obtain a modified adsorbent.

Example Embodiment

[0077] Example 2

[0078] (1) Preparation of layered double metal hydroxides

[0079] In a 2L beaker, add 1.0mol magnesium hydroxide and 1.0mol calcium hydroxide respectively, then add 500mL water, stir to mix the magnesium hydroxide and aluminum hydroxide evenly, and prepare a suspension; mix 2.4mol sodium sulfate and 500mL Water was added to a 1000mL beaker, and after stirring to dissolve it completely, a sodium sulfate solution was obtained; then the sodium sulfate solution was added to the above suspension, stirred for 30min to make it evenly mixed, and a mixed solution was obtained;

[0080] The above mixture is slowly heated to 80-90°C, the heating rate is controlled at 0.5-1.0°C/min, and after reacting at 80-90°C for 3h, cooled to room temperature, kept stirring for 3h, and then slowly heated to 60-70°C , and the heating rate is controlled at 1.0-2.0 °C/min to obtain a layered double metal hydroxide. After drying, the mass of the layered double metal hydroxide is 160 g, and a suspension of the layered double metal hydroxide with a mass concentration of 28% is prepared, and the following reaction is continued at 60-70° C.

[0081] (2) Addition of reducing salt and decolorizing adsorbent

[0082] Dissolve 1.6 mol of sodium sulfite in 200 mL of water to obtain a sodium sulfite solution; then add the sodium sulfite solution dropwise to the suspension of the above layered double metal hydroxide within 30 min and keep stirring for 2 hours to obtain a modified layered double metal hydroxide Hydroxide solution; then in the modified layered double metal hydroxide solution, under the condition of heat preservation, add 50g of activated carbon and stir for 2h, then cool to room temperature, filter, wash the filter cake with water for several times, filter until the filtrate is clear Transparent, put the filter cake in a tray and dry it in an oven at 70°C to constant weight, and collect the material to obtain a modified adsorbent.

Example Embodiment

[0083] Example 3

[0084] (1) Preparation of layered double metal hydroxides

[0085] In a 2L beaker, add 1.0mol aluminum hydroxide and 1.0mol calcium hydroxide respectively, then add 500mL water, stir to mix the aluminum hydroxide and calcium hydroxide evenly, and prepare a suspension; mix 1.0mol sodium carbonate and 500mL Water is added to a 1000mL beaker, and after stirring to dissolve it completely, a sodium carbonate solution is obtained; the sodium carbonate solution is added to the above suspension, stirred for 30min to make it evenly mixed, and a mixed solution is obtained;

[0086] The above mixture is slowly heated to 80-90°C, the heating rate is controlled at 0.5-1.0°C/min, and reacted at 80-90°C for 3 hours; then cooled to room temperature, kept stirring for 3 hours, and then slowly heated to 60-70°C ℃, the heating rate is controlled at 1.0~2.0℃/min, that is, the layered double metal hydroxide is obtained. After drying, the mass of the layered double metal hydroxide is 160 g, and the layered double metal hydrogen with a mass concentration of 20% is prepared. oxide suspension. The following reaction was continued by maintaining the suspension of the layered double metal hydroxide at 60-70°C.

[0087] (2) Addition of reducing salt and decolorizing adsorbent

[0088] Dissolve 1.0 mol of sodium bisulfite in 200 mL of water to obtain a sodium bisulfite solution; then add the sodium bisulfite solution dropwise to the suspension of layered double metal hydroxide within 30 min, and keep stirring for 1 h to obtain Modified layered double metal hydroxide solution; then in the modified layered double metal hydroxide solution, under the condition of heat preservation, add 40 g of activated clay and stir for 2 hours, then cool to room temperature, filter, filter cake with water Wash for several times, filter until the filtrate is clear and transparent, put the filter cake in a tray and dry to constant weight in an oven at 80°C, and collect the material to obtain a modified adsorbent.

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