|LV= County Championship Division Two, Chelmsford (day two)|
|Derbyshire 148: Thakor 44, White 38no, Porter 4-28|
|Essex 449-8: Cook 80, Browne 60, White 4-102|
|Essex lead by 301 runs|
|Essex 7 pts, Derbyshire 2 pts|
Essex's batsmen piled on the runs against Derbyshire to finish day two with a first-innings lead of 301 runs.
Having begun the day on 108-0, Alastair Cook (80) and Nick Browne's opening partnership was ended on 134 when Wayne White (4-102) pinned Browne lbw for 60.
Tom Westley (43), Ravi Bopara (57) and Jesse Ryder (52) all contributed as the hosts began to press the accelerator.
Graham Napier then blasted 35 and James Foster finished 51 not out to leave Essex on an imposing 449-8 at stumps.
|Chelmsford an unhappy hunting ground for Derbyshire|
|Derbyshire have won just one of their last 36 away games against Essex.|
Earlier Cook had struck 10 boundaries in his first County Championship innings of the season before he was bowled by off-spinner Wes Durston 20 runs short of his century.
Derbyshire's bowlers struggled to restrict the run-flow throughout the day as only Matt Salisbury failed to reach double figures for the hosts.
Essex batsman Nick Browne:
"I was disappointed to get out because when I arrived at the ground this morning, I was dreaming of another century to add to the couple I got last year against Derbyshire.
"But that's the game. The important thing as an opener is to get through the new ball and set things up for the run-scorers in the middle of the order and that's what's happened today."
Derbyshire bowler Tony Palladino:
"We knew it was going to be a tough day but we said we would give it our best all day and that's what we did.
"We kept our energy up and our noise levels and we felt that if we did that, we would get some rewards and we did with eight wickets.
"Hopefully, we'll bat as well as we can in the remainder of the game and make a game of it - that's all we can do."