Krav 1. Anlæg (1) til enzymatisk hydrolysering af en reaktionsblanding ((23) omfattende en batch i hvert fald delvist hydrolyserbare animalske eller vegetabilske bestanddele (26) eller en blanding af disse bestanddele, og af den art, der omfatter en reaktor (2), der har en øvre sektion med en fødeåbning (7) og en bundsektion (6) med en bundåbning (9), kendetegnet ved, at anlægget (1) yderligere omfatter en pumpe (11) og en i eller tæt ved bundåbningen (9) tilvejebragt omrører (12) til at lede et delvolumen af reaktionsblandingen (23) ud gennem reaktorens (2) bundåbning (9), når pumpen (11) er i drift. 2. Anlæg (1) ifølge krav 1, kendetegnet ved, at reaktorens (2) bundåbning (9) via pumpen (11) er forbundet med en recirkulationsledning (16), der har en første ende (17), der strækker i hvert fald et stykke op gennem reaktorens bundsektion (8) mellem omrøreren (12) og reaktorens (2) indervæg, og en anden ende (19), gennem hvilken reaktorens (2) indhold aftappes. 3. Anlæg (1) ifølge krav 2, kendetegnet ved, at recirkulationsledningens (16) første ende (17) har en afskærmning (22), der strækker sig i et plan i hovedsagen vinkelret på omrørerens (12) omdrejningsakse. 4. Anlæg (1) ifølge krav 3, kendetegnet ved, at afskærmningen (22) har en længde, der er større end eller lig med recirkulationsledningens diameter. 5. Anlæg (1) ifølge krav 2 eller 3, kendetegnet ved, at recirkulationsledningens (16) første ende (17) er bøjet i en vinkel på mellem 70° og 110°, foretrukket mellem 75° og 105° men især mellem 80° og 100°. 6. Anlæg {1) ifølge ethvert af kravene 2 - 5, kendetegnet ved, - at recirkulationsledningens (16) første ende (17) har en første ventil (18), - at reaktionsledningens (16) anden ende (19) har en anden ventil (20), - at den første ventil (18) er åben i et første tidsinterval, hvor reaktionsblandingen (23) ved hjælp af pumpen (11) recirkuleres til reaktoren (2) og derefter er lukket, at den anden ventil (20) er lukket i det første tidsinterval og er åben, når reaktoren (2) tømmes. 7. Anlæg (1) ifølge ethvert af kravene 1 - 6, kendetegnet ved, at omrøreren (12) er en blandepropel eller en roterende kniv. 8. Anlæg ifølge ethvert af kravene 1-7, kendetegnet ved, at reaktoren (2) yderligere omfatter et røreværk (12). 9. Fremgangsmåde til med et anlæg (1) ifølge ethvert af kravene 1 - 8 at fremstille et proteinholdigt hydrolysat (25) af en vandig blanding af en reaktionsblanding (23) i form af en batch af i hvert fald delvist hydrolyserbare animalske eller vegetabilske bestanddele (26) eller en blanding deraf, hvor fremgangsmåden omfatter trinnene, at opvarme blandingen (23) til en hydrolysetemperatur, at tilsætte en protease eller en blanding af proteaser, for at hydrolysere reaktionsblandingens (23) indhold af hydrolyserbart materiale, at holde reaktionsblandingen (23) dispergeret i en fastlagt hydrolysetid, * at inaktivere proteasen eller blandingen af proteaserne, kendetegnet ved, fremgangsmåden yderligere omfatter at den anden ventil (20) er lukket i hydrolysetiden, - at den første ventil (18) er åben i hydrolysetiden. - at reaktionsblandingen (23) i det forste tidsinterval, der svarer til hydrolysetiden, ved hjælp af pumpen (11) og omroreren (12) recirkuleres til reaktoren (2) gennem recirkulationsledningens (16) første åbne ventil (18), at pumpen (11) stoppes efter at det første tidsinterval er forløbet, at reaktionsblandingen (23) henstår til faseseparation i mindst tre faser, henholdsvis en fast fase (26), en vandig fase (25) og en fedtfase (24), at den første ventil (18) lukkes, at den anden ventil (20) åbnes, at aftappe den vandige fase (25) gennem recirkulationsledningens (16) anden endes (19) udløbsåbning (27), - at aftappe fedtfasen (24) gennem recirkulationsledningens (16) anden endes (19) udløbsåbning (27). 10. Fremgangsmåde ifølge krav 9, kendetegnet ved, den faste fase ( 26) pumpes ud gennem recirkulationsledningens (16) udløbsåbning (27), valgfrit efter tilsætning af vaskevand.Claim 1. System (1) for enzymatic hydrolyzing a reaction mixture ((23) comprising a batch at least partially hydrolyzable animal or vegetable constituents (26) or a mixture of these constituents, and of the nature comprising a reactor (2) ) having an upper section having a feed opening (7) and a bottom section (6) having a bottom opening (9), characterized in that the plant (1) further comprises a pump (11) and one in or near the bottom opening (9). ) provided stirrer (12) for passing a partial volume of the reaction mixture (23) through the bottom opening (9) of the reactor (2) when the pump (11) is in operation 2. An installation (1) according to claim 1, characterized in that: the bottom opening (9) of the reactor (2) via the pump (11) is connected to a recirculation line (16) having a first end (17) extending at least a distance through the bottom section of the reactor (8) between the stirrer (12) and the inner wall of the reactor (2), and another end (19) through which the contents of the reactor (2) are drained. g (1) according to claim 2, characterized in that the first end (17) of the recirculation line (16) has a shield (22) extending in a plane substantially perpendicular to the axis of rotation of the stirrer (12). System (1) according to claim 3, characterized in that the shield (22) has a length greater than or equal to the diameter of the recirculation line. System (1) according to claim 2 or 3, characterized in that the first end (17) of the recirculation line (16) is bent at an angle of between 70 ° and 110 °, preferably between 75 ° and 105 ° but especially between 80 ° and 100 °. System (1) according to any one of claims 2 to 5, characterized in that - the first end (17) of the recirculation line (16) has a first valve (18) - that the second end (19) of the reaction line (16) has a second valve (20) - the first valve (18) is open for a first time interval in which the reaction mixture (23) is recycled to the reactor (2) by means of the pump (11) and then closed, the second valve (20) is closed during the first time interval and is open when the reactor (2) is emptied. System (1) according to any one of claims 1 to 6, characterized in that the stirrer (12) is a mixing propeller or a rotary knife. Installation according to any one of claims 1-7, characterized in that the reactor (2) further comprises a stirrer (12). A process for producing, with a plant (1) according to any one of claims 1 to 8, a proteinaceous hydrolyzate (25) of an aqueous mixture of a reaction mixture (23) in the form of a batch of at least partially hydrolysable animal or vegetable ingredients. (26) or a mixture thereof, the process comprising the steps of heating the mixture (23) to a hydrolysis temperature, adding a protease or mixture of proteases, to hydrolyze the hydrolysable material of the reaction mixture (23), to keep the reaction mixture (23). ) dispersed for a fixed hydrolysis time, * inactivating the protease or mixture of the proteases, characterized in that the method further comprises the second valve (20) being closed during the hydrolysis time, - the first valve (18) being open during the hydrolysis time. - in the first time interval corresponding to the hydrolysis time, the reaction mixture (23) is recirculated to the reactor (2) by the pump (11) and the stirrer (12) through the first open valve (18) of the recirculation line (16), ) is stopped after the first time interval has elapsed, that the reaction mixture (23) is allowed to phase separation in at least three phases, respectively a solid phase (26), an aqueous phase (25) and a fat phase (24), that the first valve (18) ) is closed, the second valve (20) is opened to drain the aqueous phase (25) through the outlet end (27) of the recirculation line (16), - to drain the fat phase (24) through the second end of the recycle line (16). 19) outlet opening (27). Process according to claim 9, characterized in that the solid phase (26) is pumped out through the outlet opening (27) of the recirculation line (16), optionally after the addition of washing water.