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Preparation method of polymerized aluminium chloride having high aluminium content

A polyaluminum chloride, high content technology, applied in the direction of aluminum chloride, aluminum halide, flocculation/precipitation water/sewage treatment, etc., can solve the problems of long production process, poor dispersion performance, output limitation, etc., achieve short reaction cycle, The effect of low impurity content and high utilization rate of raw materials

Inactive Publication Date: 2006-01-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To sum up, the three methods of preparing polyaluminum chloride by reacting aluminum hydroxide and hydrochloric acid have their own advantages and disadvantages. The common problem is that the production process is long and complicated, which limits the output to a certain extent, and thus the cost is relatively high.
Especially the aluminum content in polyaluminum chloride is low, when the aluminum content in the liquid is high, it is difficult to flow; after forming a solid, x-diffraction shows that it is in a crystal state, and the dispersion performance is poor

Method used

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  • Preparation method of polymerized aluminium chloride having high aluminium content
  • Preparation method of polymerized aluminium chloride having high aluminium content
  • Preparation method of polymerized aluminium chloride having high aluminium content

Examples

Experimental program
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Effect test

Embodiment 1

[0035] In a 250mL acid-resistant reaction kettle, measure 64mL of distilled water and add it, and then add 120mL of concentrated hydrochloric acid with a concentration of 36% (mass ratio) and a density of 1.19g / mL in the reaction kettle, and slowly add and measure under stirring conditions. 90g of aluminum hydroxide powder, after adding 4g of orthophosphoric acid catalyst A, carry out chemical reaction under the pressure of 1.5Kgf / cm2, when the reaction temperature is 110°C, keep the thermometer for 4 hours, take out the reaction mixture and put it in the sedimentation tank After aging for 16 hours, the lower sediment was returned to the reactor to continue the reaction, and the upper liquid was polyaluminum chloride sample 1#. The experimental results are shown in Table 1, and its structure is shown in Figure 1.

Embodiment 2

[0037]Adopt the condition of embodiment 1, difference is the phosphorous acid catalyst A of 12g and concentrated hydrochloric acid add simultaneously, at 2Kgf / cm 2 The chemical reaction is carried out under pressure. When the reaction temperature is 110°C, keep the thermometer for 5 hours, take out the reaction mixture and put it in the sedimentation tank for aging for 20 hours. The lower layer of sediment is returned to the reactor to continue the reaction. Aluminum sample 2#, the experimental results are shown in Table 1, and its structure is shown in Figure 1.

Embodiment 3

[0039] Adopt the condition of embodiment 1, difference is that concentrated hydrochloric acid reacts with aluminum hydroxide after 0.5 hour, then adds the ammonium dihydrogen phosphate catalyst A of 16g, at 3Kgf / cm 2 Continue the reaction under pressure. When the reaction temperature is 120°C, keep the thermometer for 6 hours, take out the reaction mixture and put it in the sedimentation tank for aging for 48 hours. Aluminum sample 3#, the experimental results are shown in Table 1, and its structure is shown in Figure 1.

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Abstract

A process for preparing high-Al aluminium polychloride from aluminium hydroxide includes such steps as mixing aluminium hydroxide with industrial hydrochloric acid, adding the catalyst containing P compound and Al compound, heating to 90-180 deg.C, reacting under 1-8.0 Kg / sq.cm for at least 2 hr, depositing and taking supernatant as product.

Description

technical field [0001] The invention relates to polyaluminum chloride, in particular to a preparation method of polyaluminum chloride with high aluminum content. Background technique [0002] At present, polyaluminum chloride, also known as basic aluminum chloride or aluminum hydroxychloride, is an intermediate polymer compound between aluminum trichloride hexahydrate and aluminum hydroxide, and its general chemical formula is [Al 2 (OH) n Cl 6-n ] m , where m is less than or equal to 10, and n is equal to 1 to 5. Since polyaluminum chloride is a polymer compound formed by hydroxyl bridging polymerization, it is very soluble in water and can undergo hydrolysis to produce a series of physical and chemical effects such as coagulation, adsorption, and precipitation. Therefore, polyaluminum chloride is often used as a water treatment agent to remove impurities in water. However, due to the low concentration of the prepared polyaluminum chloride and the difficult drying cond...

Claims

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Application Information

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IPC IPC(8): C01F7/56C02F1/52
Inventor 张忠东高雄厚张海涛孙艳波汪毅刘从华
Owner PETROCHINA CO LTD
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