阅读说明：本技术 硅铝比在20-26之间的丝光沸石合成方法 (Method for synthesizing mordenite with silicon-aluminium ratio of 20-26 ) 是由 李庆宁 于 2019-11-20 设计创作，主要内容包括：一种硅铝比在20-26之间的丝光沸石合成方法,包括以下步骤：注入并搅拌自来水,形成搅拌水环境；在搅拌水环境下按照下列摩尔量比投入试剂；氢氧化钠14.6-24.4；硫酸铝0.9-1；二氧化硅29.5-40；其中,水的摩尔比为500-800；投入丝光沸石晶种；按照预设的温度曲线提供温度环境,从而,可以制备硅铝比在20-26之间的丝光沸石。(A method for synthesizing mordenite with a silicon-aluminum ratio of 20-26, which comprises the following steps: injecting and stirring tap water to form a stirring water environment; adding reagents according to the following molar weight ratio under a stirring water environment; 14.6 to 24.4 portions of sodium hydroxide; 0.9-1 of aluminum sulfate; 29.5-40 parts of silicon dioxide; wherein the molar ratio of the water is 500-800; putting mordenite seed crystals; providing a temperature environment according to a preset temperature curve, thereby preparing the mordenite with the silicon-aluminum ratio of 20-26.)

1. A method for synthesizing mordenite with a silicon-aluminum ratio of 20-26, which is characterized by comprising the following steps:

injecting and stirring tap water to form a stirring water environment;

adding reagents according to the following molar weight ratio under a stirring water environment;

14.6 to 24.4 portions of sodium hydroxide;

0.9-1 of aluminum sulfate;

29.5-40 parts of silicon dioxide;

wherein the molar ratio of the water is 500-800;

putting mordenite seed crystals;

and providing a temperature environment according to a preset temperature curve.

2. A mordenite synthesis method as claimed in claim 1, wherein the mordenite seed crystal is Na-type mordenite at a charging ratio of 0.5% -2%.

3. A mordenite synthesis process as claimed in claim 1, wherein the temperature environment is uniformly heated from room temperature to 155-185 ℃ for 18-48 hours.

4. A mordenite synthesis process as claimed in claim 1, wherein the agitated aqueous environment is 160 rpm.

5. A method for synthesizing mordenite with a silicon-aluminum ratio of 20-26, which is characterized by comprising the following steps:

injecting and stirring tap water to form a stirring water environment;

adding reagents according to the following molar weight ratio under a stirring water environment;

4.3-9.5 parts of sodium oxide;

0.9-1 of alumina;

29.5-40 parts of silicon dioxide;

wherein the molar ratio of the water is 550-800;

putting mordenite seed crystals;

and providing a temperature environment according to a preset temperature curve.

6. A mordenite synthesis method as claimed in claim 5, wherein the mordenite seed crystal is Na-type mordenite at a charging ratio of 0.5% -2%.

7. A mordenite synthesis process as claimed in claim 5, wherein the temperature environment is uniformly heated from room temperature to 155-185 ℃ for 18-48 hours.

8. A mordenite synthesis process as claimed in claim 5, wherein the agitated aqueous environment is 160 rpm.

Technical Field

The application relates to the field of mordenite preparation, in particular to a method for synthesizing mordenite with a silicon-aluminum ratio of 20-26.

Background

Mordenite is a zeolite with a high silica-alumina ratio, is widely applied to the fields of petrochemical industry such as catalytic cracking, dewaxing pour point depression, methanol oxidation and the like, and has wide application prospects in the fields of fine chemical industry, building materials, environmental protection and the like.

Since mordenite has better reaction activity in the reaction processes of catalysis, isomerization and the like due to higher silicon-aluminum ratio, the improvement of the silicon-aluminum ratio is always the research focus of researchers since the artificial synthesis of mordenite.

Mordenite is generally synthesized by dynamic crystallization. The influencing factors mainly comprise raw materials, alkalinity of a reaction system, a solvent, anions, a mineralizer, a template agent, crystallization temperature, crystallization time and the like. In the industrial production process, various organic templates are excessively used, so that the economic cost is increased, and the pressure of environmental protection is also caused.

The inventor works in the national institute of petrochemical and chemical industry for many years, and continues to engage in the synthesis experiment of the mordenite with high silica alumina ratio from the machine edge after retirement, and finds a method for preparing the mordenite with high silica alumina ratio, which has the advantages of cheap and easily obtained raw materials, no use of any template agent, mild crystallization conditions and easy industrial popularization.

Disclosure of Invention

Based on this, it is necessary to provide a stable preparation method for the problem that the mordenite with high silica-alumina ratio is difficult to be industrially prepared.

A method for synthesizing mordenite with a silicon-aluminum ratio of 20-26 is characterized by comprising the following steps:

injecting and stirring tap water to form a stirring water environment;

adding reagents according to the following molar weight ratio under a stirring water environment;

14.6 to 24.4 portions of sodium hydroxide;

0.9-1 of aluminum sulfate;

29.5-40 parts of silicon dioxide;

wherein the molar ratio of the water is 500-800;

putting mordenite seed crystals;

and providing a temperature environment according to a preset temperature curve.

In one embodiment, the mordenite seed crystal is Na-type mordenite, and the adding proportion is 1%.

In one embodiment, the temperature environment is uniformly heated to 155-185 ℃ from room temperature within 2 hours and is kept for 18-48 hours.

In one embodiment, the agitated aqueous environment is 160 rpm.

The application also provides a method for synthesizing mordenite with the silicon-aluminum ratio of 20-26, which is characterized by comprising the following steps:

injecting and stirring tap water to form a stirring water environment;

adding reagents according to the following molar weight ratio under a stirring water environment;

4.3-9.5 parts of sodium oxide;

0.9-1 of alumina;

29.5-40 parts of silicon dioxide;

wherein the molar ratio of the water is 550-800;

putting mordenite seed crystals;

and providing a temperature environment according to a preset temperature curve.

In one embodiment, the mordenite seed crystal is Na-type mordenite, and the adding proportion is 1%.

In one embodiment, the temperature environment is uniformly heated to 155-185 ℃ from room temperature within 2 hours and is kept for 18-48 hours.

In one embodiment, the agitated aqueous environment is 160 rpm.

The embodiment provided by the application has at least the following beneficial effects:

high silica to alumina ratio mordenites between 20 and 26 can be prepared according to the process conditions provided.

Detailed Description

For convenience of presentation, the reagents and reaction vessels used in the experiments are first briefly described below.

Reagent:

silicon powder, a domestic industrial product, and a main component of silicon dioxide, wherein the dry basis content is more than 99 percent, and the water content is 7.25 percent.

Silica sol, technical grade, 30% of silicon dioxide and 0.4% of sodium oxide.

Aluminum sulfate, domestic industrial grade product, water content 9.2%.

Sodium hydroxide, a domestic industrial grade product, with the content more than or equal to 99 percent.

Water, domestic tap water.

Deionized water, technical grade.

A synthesis device: 2L of a quick-opening rotary stirring reaction kettle.