Senior 1 chemical industry process questions, chemical industry process questions

Operation 2 should be to add excess NaOH to the solution obtained in the first step, if so, as follows:

Operation 1 is called dissolution, and operation 2 is called precipitation.

Step 1 reaction: mg + H2SO4 == H2 + mgSO4, 2AL + 3H2SO4 == 3H2 +Al2(SO4)3, SiO2 does not react.

Gas X is H2, Filtrate Y contains magnesium sulfate and aluminum sulfate and residual sulfuric acid, and solid Z is silicon dioxide.

Step 2 Reaction:

h2so4 + 2naoh == na2so4 + 2h2o

mgso4 + 2naoh == mg(oh)2↓ +na2so4

al2(so4)3 + 6naoh == al(oh)3↓ +3na2so4

Al(OH)3 + NaOH == Naalo2 + 2H2O (excess sodium hydroxide, which dissolves aluminum sulfate).

The solid M is Mg(OH)2, and there are sulfate, OH-, metaaluminate in the filtrate N.

Z is SiO2 and can react with NaOH and SiO2 + 2NaOH == Na2SiO3 + H2O

2Al+3H2SO4=Al2(SO4)3+3H2, SiO2 does not react with H2SO4. Gas X - H2 filtrate Y---H2SO4, Al2(SO4)3Solid z---sio2

SiO2+2NaOH=Na2SiO3 +H2O, the rest is not as good as the above description. Hope it helps.

If you are not rigorous in this question, it will give people a misunderstanding, and I personally think that operation 2 should add excessive sodium hydroxide on the basis of operation 1.

x should be hydrogen.

Solid Z should be silica.

The solid M should be magnesium hydroxide.

There should also be hydroxide examples and metaaluminate ions in the filtrate.

Silica can react with sodium hydroxide to form sodium silicate.

The questions about the processes in the chemical industry are as follows:

The chemical production process refers to the production process of chemical processing of raw materials to obtain a valuable product. Due to the diversity of raw materials and products and the complexity of the production process, tens of thousands of chemical production processes have been formed.

Throughout the complex chemical production process, it is organically composed of chemical (biological) reactions and several physical operations. Among them, chemical (biological) reactions and reactors are the core of chemical production, and physical processes play a role in preparing suitable reaction conditions for chemical (biological) reactions and separating and purifying reactants to obtain final products.

Chemical production process: the process of transforming raw materials into products through chemical reactionsChemical process refers to the production process of the chemical industry, one of its characteristics is that there are many operation steps, and the raw materials can only become products after passing through a number of or several groups of equipment in each step. Due to the different raw materials used and the resulting products in different chemical industries, the various chemical processes vary greatly.

The general process of chemical production can be summarized as follows: chemical raw materials--- various pre-treatment (crushing, impurity removal, mixing) - chemical processing--- various post-processing (extraction) - chemical equipment to be used in each stage of chemical products is as follows:

Raw materials: various pre-treatment of chemical raw materials: crushing equipment, mixing equipment, pressure equipment, refrigeration equipmentChemical processing: reaction equipment, pressure equipment, refrigeration equipment, heat transfer equipment, various post-processing: separation equipment, concentration crystallization, drying equipment, environmental protection equipment, <>

Chemical products: storage and transportation equipment, molding equipment, packaging equipment, special materials for the industry, the transmission process experienced in the chemical production process of the rubber and high rubber industry (in terms of physical nature, there are the following three types).

momentum transfer processes (single-phase or multiphase flow); The heat transfer process, the heat transfer mass transfer process, and the mass transfer process have become a unified research object, and it is also a main line that connects the operation of each unit. Three passes + one reverse constitute a variety of process manufacturing processes.

When solving such problems:

First, read the questions roughly and try to understand the flowchart, but you don't have to push out every substance.

Secondly, read the test questions intensively and carefully study a certain step or a certain substance according to the questions.

First of all, systematic and proficient knowledge of chemistry is required. Don't rush to solve the problem when you see it. There will usually be a flowchart or a large explanatory text with information that will help solve the problem.

After reading the dry materials, you can basically start to do the questions. And it will be more handy. I won't scratch my ears and cheeks, and I will have a very accurate grasp of the test point of this question after reading the information, and the accuracy rate will naturally be high!

First of all, I recommend a book, Chemistry Elective Series 2, "Chemistry and Technology", which introduces a lot of industrial knowledge related to chemistry, including the production of nitric acid in sulfuric acid, magnesium extraction from seawater, etc. The second is that I usually combine the relevant industrial processes with chemical equations to memorize and do more questions.

It is necessary to be familiar with the process of sulfuric acid industry (mainly industrial sulfuric acid production in mainland China) industrial synthetic ammonia industry Hou's alkali production method.

Quite simply, focus on three areas. 1. Important common metals (Fe, Al, Cu) and non-metals (halogen elements, sulfur, and ammonia). 2. Basic experimental operations and methods.

3. Principles and laws of chemical reactions (redox, ionic reactions, equilibrium, hydrolysis, precipitation transformation, organic synthesis).Do you understand? This is the permanent theme of the college entrance examination.

It is recommended to take a look at the textbook of Elective 2, which will be enlightening.

First of all, browse overall, find out the breakthrough, sometimes find a breakthrough all the problems will be solved, but, I advise you to do more basic knowledge, only when the foundation is laid can there be a faster solution, because the most important thing in the college entrance examination is time.