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Method for preparing precipitated silica by continuous method

A technology of precipitated silica and continuous method, which is applied in the direction of silica, silica, etc., can solve the problems of poor acid-base mixing uniformity and product performance degradation, and achieve high production efficiency, stable product performance, and consistent performance Effect

Pending Publication Date: 2019-02-12
FUJIAN SANMING TONGSHENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the expansion of the reaction tank, the uniformity of acid-base mixing is getting worse, which causes the product performance to decline with the expansion of the reaction tank.

Method used

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  • Method for preparing precipitated silica by continuous method
  • Method for preparing precipitated silica by continuous method
  • Method for preparing precipitated silica by continuous method

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Effect test

Embodiment 1

[0019] A method for preparing precipitated silica by a continuous method, comprising the steps of:

[0020] (1) Preparation of seed crystals: prepare 10kg of 3wt% sodium silicate aqueous solution, pass through a cation exchange resin, control the pH of the silicic acid solution at the ion exchange outlet to 4.2, and then use sodium silicate to adjust the pH of the silicic acid solution after exchange to 9.0 , add to the reaction tank and raise the temperature to 85°C, keep it warm for 30min, and set it aside;

[0021] (2) Precursor synthesis: Add water to sodium silicate to prepare a 4wt% aqueous solution, and add water to sulfuric acid to prepare a 30wt% aqueous solution. At 30°C, at 2.5kg / cm 2 Add the sodium silicate solution into the funnel-shaped acid-base high-efficiency mixer 1 at a speed of 300mL / min under a certain pressure, and at the same time add sulfuric acid solution to control the pH8. The outlet diameter of the device is limited to 10mm;

[0022] (3) Synthesis...

Embodiment 2

[0027] A method for preparing precipitated silica by a continuous method, comprising the steps of:

[0028] (1) Preparation of seed crystals: Prepare 10kg of 4wt% sodium silicate aqueous solution, pass through cation exchange resin, control the pH of the silicic acid solution at the ion exchange outlet to 4.5, and then use sodium silicate to adjust the pH of the silicic acid solution after exchange to 9.4 , add to the reaction tank and raise the temperature to 83°C, keep it warm for 30min, and set it aside;

[0029] (2) Precursor synthesis: Add water to sodium silicate to prepare a 5wt% aqueous solution, and add water to sulfuric acid to prepare a 35wt% aqueous solution. 2 Add the sodium silicate solution into the funnel-shaped acid-base high-efficiency mixer 1 at a speed of 250mL / min under a certain pressure, and at the same time add sulfuric acid solution to control the pH8. The outlet diameter of the device is limited to 5mm;

[0030] (3) Synthesis of precipitated silica:...

Embodiment 3

[0035] A method for preparing precipitated silica by a continuous method, comprising the steps of:

[0036] (1) Preparation of seed crystals: prepare 10kg of 5wt% sodium silicate aqueous solution, pass through cation exchange resin, control the pH of the silicic acid solution at the ion exchange outlet to 4.2, and then use sodium silicate to adjust the pH of the silicic acid solution after exchange to 9.5 , add to the reaction tank and raise the temperature to 90°C, keep it warm for 40min, and set it aside;

[0037] (2) Precursor synthesis: Add water to sodium silicate to prepare a 6wt% aqueous solution, and add water to sulfuric acid to prepare a 40wt% aqueous solution. At 30°C, at 2.5kg / cm 2 Under the pressure of 220mL / min, sodium silicate solution is added to the funnel-shaped acid-base high-efficiency mixer 1, and sulfuric acid aqueous solution is added at the same time to control the pH at the outlet of the funnel-shaped acid-base high-efficiency mixer 1. The funnel-shape...

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Abstract

The invention provides a method for preparing precipitated silica by a continuous method. According to the method, a stirring type reaction kettle is eliminated, a funnel-shaped acid-base high-efficiency mixer is utilized to quickly mix sodium silicate with sulfuric acid, and then the sodium silicate and the sulfuric acid are mixed with seed crystal to react to form a precipitated silica product under a certain temperature. As the funnel-shaped high-efficiency mixer can achieve instant mixing between the sodium silicate and the sulfuric acid, the prepared precipitated silica has fundamentallyidentical performance, and the bottleneck of precipitated silica production is broken.

Description

technical field [0001] The invention belongs to the field of inorganic synthesis, and more specifically relates to a continuous method for preparing precipitated silica. Background technique [0002] The research and production of precipitated silica started and developed based on the needs of the rubber industry. At present, the precipitation method occupies a dominant position in the rubber industry. will play an important role for a long time to come. [0003] Precipitated silica is a white powder of hydrated amorphous silicic acid with the molecular formula mSiO 2 ·nH 2 O, has an irregular binary linear structure. Since the invention of precipitated silica, the process parameters and behavior of different conditions have been thoroughly studied. Its theoretical research has also made continuous progress. The production methods of precipitated silica include (1) sol method, (2) acid-salting out precipitation method, (3) direct silica precipitation method, and the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
CPCC01B33/12C01P2006/12C01P2004/61
Inventor 卢元方陈家茂余惠华
Owner FUJIAN SANMING TONGSHENG CHEM
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