37results about How to "Promote sustainable economic development" patented technology

The invention relates to a roller steel slag fine aggregate and composite slag powder cemented material, which solves the problem that the existing steel slag can not completely replace cement for producing the cemented material owing to high production cost and can be only made into low-strength (less than C30) concrete. The cemented material is composed of composite slag powder and roller steelslag in the weight ratio of 1:1-4; and the composite slag powder is composed of 8-35wt% of a blended material and 65-92wt% of the slag powder, wherein, the blended material is made by finely grindingat least one of 25-99wt% of plaster, 0-75wt% of silicate cement clinker and 0-5wt% of an additive. The cemented material of the invention can completely replace a cementitious material, and the material has the advantages of high strength grade, simple production process, low production cost and stable product performances, thus being especially applicable to preparing high-strength concrete withgood service performances and various engineering with higher flexural strength requirement.

The invention discloses a method for preparing salt-free 2-amino-1,5-naphthalenedisulfonic acid, which comprises the following steps: (1) performing a sulfonation reaction; (2) refining sulfonation solution; (3) performing acid eduction; (4) decreasing and maintaining temperature; (5) centrifuging; (6) refining acid filtrate; and (7) recovering sulphuric acid tail gas and SO3 gas. Based on the technical scheme of the invention, the method for preparing salt-free 2-amino-1,5-naphthalenedisulfonic acid is suitable for industrial production, requires low sulfonation reaction temperature and mild reaction conditions, causes fewer byproducts, realizes high conversion rate and high selectivity, lowers labor intensity, allows the acid filtrate and harmful gas to be recycled and relieves environment pollution.

The invention relates to a method for preparing p-aminodiphenylamine, which comprises the following: (1) a step of condensation, in which, nitrobenzene and aniline produce condensation reaction in the presence of a catalyst to generate condensation solution including 4-nitrodiphenylamine and 4-nitrosodiphenylamine; (2) a step of extraction, in which, water phase and organic phase in the condensation solution are separated by an extracting method; (3) a step of reduction, in which, hydrogen and the organic phase of the condensation solution produce reduction reaction in the presence of the catalyst to generate reduction solution including the p-aminodiphenylamine; (4) a step of separation, in which, the p-aminodiphenylamine is separated from the reduction solution to form crude p-aminodiphenylamine feed liquid; and (5) a step of rectification, in which, the p-aminodiphenylamine is separated from the crude p-aminodiphenylamine feed liquid in a rectification mode to form a p-aminodiphenylamine product. The method is suitable for serialized industrialized production in large scale, and has the advantages of low reduction reaction temperature, mild reaction condition, few side products, high conversion rate and selection, low labor intensity and no corrosive liquid, thereby reducing pollution to environment.

The invention discloses a degradation device and method for landfill leachate based on a microbial fuel cell-Fenton system. The degradation device includes: a left chamber and a right chamber, and the left chamber and the right chamber pass proton The exchange membrane is separated, the left chamber is the anode chamber of the electric Fenton system, the right chamber is the cathode chamber of the electric Fenton system, and the left chamber is equipped with a microbial fuel cell, which is used for the electric Fenton through the action of microorganisms. The voltage is provided by the Dayton system; the anode electrode is arranged in the left chamber; two groups of first cathode electrodes and a group of second cathode electrodes are arranged in the right chamber at intervals, wherein a group of first cathode electrodes and anode electrodes connected through a first external circuit, another set of first cathode electrodes and second cathode electrodes are connected through a second external circuit; and a first resistance box and a second resistance box. The invention couples the microbial fuel cell and the electric Fenton system, and has the characteristics of high-efficiency degradation, energy saving and no secondary pollution.