171results about How to "Ease of industrial preparation" patented technology

The invention belongs to the technical field of medicinal chemistry and in particular relates to a gefitinib ethylene glycol solvate, a preparation method of the solvate, and a method for preparing a high-purity gefitinib Form 1 crystal form by adopting the gefitinib ethylene glycol solvate. The gefitinib ethylene glycol solvate is simple in large-scale preparation, easy to operate, high in stability and high in purity and can be used for preparing the high-purity gefitinib Form 1 crystal form.

The invention discloses a core-shell structure lightweight aggregate prepared by a cold bonding method and a preparation method thereof. The method comprises the steps: preparing a calcined clay-basedgreen environment-friendly cementing material from ordinary Portland cement, calcined clay, limestone powder and gypsum in proportion; putting core material particles into a lightweight aggregate granulation device, then putting the calcined clay-based green environment-friendly cementing material, and uniformly spraying a mixture for granulation to form primarily-generated cold-bonded aggregate;carrying out primary maintenance on the primarily-generated cold-bonded aggregate, soaking the primarily-generated cold-bonded aggregate in a solution containing organic acid or phenol compounds, taking out the primarily-generated cold-bonded aggregate, airing the primarily-generated cold-bonded aggregate, and repeatedly spraying a calcium hydroxide aqueous solution on the surface of the aggregate to form aggregate with a super-hydrophobic surface; and continuously putting the aggregate with the super-hydrophobic surface into water for secondary maintenance, and thus producing the super-hydrophobic high-strength lightweight aggregate. According to the core-shell structure lightweight aggregate and the preparation method thereof, energy is saved, consumption is low, the processing flow issimplified, solid waste recycling can be achieved, the water absorption rate is low, and the single bearing capacity is high.

This flexible pipe for transporting fluid comprises a polymer internal sheath for limiting a fluid flow passage of central axis (A-A '); at least one armour layer arranged on the outside of the internal sheath; an internal carcass (26), arranged in the internal sheath, the internal carcass (26) comprising a first folded tape (31) limiting a helical gap (40) opening towards the central axis (A-A '). The pipe comprises a helicoidal insert (28) of T-shaped cross section comprising a leg (50) inserted in the helicoidal gap (40) and two wings (52) projecting one on each side of the leg (50) to close off the helicoidal gap (40) toward the inside. The helicoidal insert (28) is formed of a second folded tape.

The invention provides an active carbon produced from an infusible carbonaceous material as a raw material, which active carbon when used for prevention of automobile fuel evaporation, etc., would not cause any trouble attributed to dust generation, exhibiting reduced pressure loss; and a process for producing the same. There is provided a spherical active carbon produced from an infusible solid carbon material as a raw material, wherein providing that x represents an average particle diameter (mm) and y an MS hardness (%), when x is in the range of 0.5 to 20, y is >= 100x(1-0.8x1.45<(0.3-x)>). This spherical active carbon can be produced by a process comprising mixing a carbon material with a carbonizable binder; extruding the mixture into a strand form; carrying out rolling granulation so as to obtain a spherical form; rendering the same infusible under appropriate conditions corresponding to the particle size; and performing carbonization and thereafter activation under conditions appropriately restricting the contact with activation gas.