The phrase "a separate batch of" is correct and usable in written English.
It can be used when referring to a distinct group or collection of items that is different from another group.
Example: "We will prepare a separate batch of cookies for those with dietary restrictions."
Alternatives: "an additional set of" or "a distinct group of".
Last year, UBS announced a separate batch of 3,500 job cuts.
Last year, the bank announced a separate batch of 3,500 job cuts.
But come April, another group of investors is owed a payment on a separate batch of general-obligation warrants worth about $96 million.
Governor Davis, who also announced a separate batch of emergency conservation measures, including a compulsory plan to curtail outdoor lighting at retail businesses like car dealerships, undertook frantic last-minute lobbying for the bill.
Transfection of a separate batch of cells with the new plasmid, XPort/HChrR6, generated EVs containing HChrR6 mRNA; incubation with pure EVHB enabled these to target the HER2 receptor, generating "EXO-DEPT" EVs.
A separate batch of syrup consisting of sugar and corn syrup is boiled to between 135 and 140 °C (275 and 285 °F), depending on the texture desired, then beaten vigorously with the frappé.
On each day, observers were shown a batch (11 or 12 clips) of OF clips and a separate batch (13 or 14 clips) of EPM clips, with a break between batches.
The database is so that when someone wants to find out about a weapon, monster or other thing they can go put it in the database which is a separate batch program with all of the information inside of it.
If desired, you can prepare a second, separate batch of the marinade and use it as a sauce or glaze.
Therefore, it was less costly with lower administrative input to produce a smaller separate batch of letters to send out than if we had used equal allocation.
This observation is commonly seen among relative abundances of trace elements in melt inclusions because the whole rock often represents an average of separate batches of magma that are trapped in the melt inclusions (e.g., Sobolev and Shimizu 1993; see review by Schiano 2003).
