Abstract: Provided is a method for separating water-containing crystals, the method including: a step of generating water-containing crystals from a mixed liquid including water, acetic acid, and methacrylic acid; and a step of separating the crystals, in which the proportion by mass of methacrylic acid with respect to the total mass of water, acetic acid, and methacrylic acid in the mixed liquid is 0.09% by mass or more and less than 0.60% by mass.

Abstract: A method for purifying methacrylic acid, including mixing raw material methacrylic acid and methanol; precipitating a crystal of methacrylic acid from the mixed solution; and separating the crystal and mother liquor, wherein the raw material methacrylic acid and methanol are mixed so that a concentration of methanol in the mixed liquid is 3.0 to 3.75% by mass, and the crystal of methacrylic acid is precipitated from the mixed solution in a cooling crystallization vessel.

Abstract: A method for purifying methacrylic acid, including mixing raw material methacrylic acid and methanol; precipitating a crystal of methacrylic acid from the mixed solution; and separating the crystal and mother liquor, wherein the raw material methacrylic acid and methanol are mixed so that a concentration of methanol in the mixed liquid is 3.0 to 3.75% by mass, and the crystal of methacrylic acid is precipitated from the mixed solution in a cooling crystallization vessel.

Abstract: Since icons for identifying the contents of orders received or orders placed and the numbers of data representing the processing a status of the orders received or orders placed are displayed in combination to manage orders received and orders placed for parts, the processing status such as orders expected to be received, determination of orders, delay in scheduling, acceptance, and the like in the shop can be visually and quickly checked. Detailed information associated with the orders expected to be received, determination of orders, delay in scheduling, and the like is visually presented as a graph and table which correspond to the parts management items identified by icons. Progress in order received/placed processing can be reviewed on a day-to-day basis, and comparison of a plurality of managed items can be made, thus realizing versatile parts management.

Abstract: Since icons for identifying the contents of orders received or orders placed and the numbers of data representing the processing a status of the orders received or orders placed are displayed in combination to manage orders received and orders placed for parts, the processing status such as orders expected to be received, determination of orders, delay in scheduling, acceptance, and the like in the shop can be visually and quickly checked. Detailed information associated with the orders expected to be received, determination of orders, delay in scheduling, and the like is visually presented as a graph and table which correspond to the parts management items identified by icons. Progress in order received/placed processing can be reviewed on day-to-day basis, and comparison of a plurality of managed items can be made, thus realizing versatile parts management.

Abstract: A method for preparing a polyisocyanurate composite obtained by injecting a formulated liquid comprises an organic polyisocyanate, a polyol and a trimerization catalyst into a mold in which a fibrous reinforcing material is previously set by use of a reaction injection molding machine, wherein:(1) a single or mixed polyether polyol having a hydroxyl value of 40 to 400 is used as the polyol; and(2) the formulation ratio of the organic polyisocyanate and the polyol in terms of the isocyanurated isocyanate concentration [NCO].sub.T defined by the following formula (1) is in the range of 3.0 to 5.5 mmol/g: ##EQU1## [NCO].sub.T : theoretical concentration of isocyanate group consumed in isocyanuration;[NCO].sub.O : isocyanate group concentration in organic polyisocyanate (mmol/g);OH-V: hydroxyl value of single or mixed polyol;W.sub.A : weight fraction of organic polyisocyanate.

Abstract: A method for producing a polyurethane type composite obtained by injecting a formulated liquid comprises an organic polyisocyanate, a polyol and a curing catalyst into a mold in which a fibrous reinforcing material is previously set, followed by curing, by means of a reaction injection molding machine, characterized in that:(1) a polyol component having a hydroxyl value of 300 to 800 is used as the polyol, and(2) an organic acid salt of a tertiary amine is used as the curing catalyst.